StructureSpot

New Man-Made Reefs Heading To Gulf Floor

Man-made reefs similar to this will be deployed off Escambia County between now and June, 2019.
CREDIT ESCAMBIA COUNTY MARINE RESOURCES

More than 700 new artificial reefs are going into the waters off Pensacola in the next few months, in phase two of a program funded by the BP settlement of the 2010 oil spill.

According to the Florida Fish and Wildlife Conservation Commission, for every dollar spent on artificial reefs in the Florida Panhandle, the conservative overall economic benefit is roughly $138.

“We’ve been trying to do this the whole time I’ve been on the [Commission]; actually, even before I got on the Board Escambia County had taken a fairly aggressive position on reefing,” said Escambia County Commissioner Grover Robinson, who chairs the Gulf Consortium, 23 Florida counties affected by the Deepwater Horizon explosion and resulting oil spill.

The money’s coming from the Natural Resource Damage Assessment, NRDA, which is aimed at compensating for environmental damages in those counties.

“When NRDA came about, Escambia County residents lost the whole spring and summer of fishing [in 2010] due to the oil spill,” Robinson said. “That we knew there was something that we needed to do to compensate those individuals.”Not just the people that commercially fish; but also our recreational fishers.”

Dropping artificial reefs off the coastline is going beyond Escambia; Santa Rosa, Okaloosa, Walton and Bay Counties also have programs. Robinson calls it a “common thread” across northwest Florida to build habitat that can translate into more tourist revenues.

Escambia Co. Commissioner Grover Robinson, Chairman of the Gulf Consortium.
CREDIT DAVE DUNWOODY, WUWF PUBLIC MEDIA

“Not only do you have the tourist dollars that come from the actual charter on your boat going out with people and doing the fishing, you have the supplies they buy; the tackle, the line, the rods, the reels,” said Robinson. “But more than that, you also get the hotel stays; they eat, they usually stay here.”

Two local firms will share $2.2 million in NRDA money to build the reefs. Walter Marine of Orange Beach will get $1.7 million to provide 77 large tetrahedron, or triangular pyramid, reefs, and about 300 smaller reefs. Coastal Reef Builders of Pensacola will use $531,000 to build 350 large dome reefs.

“We’re ready to go,” Robinson says. “We’re ready to get them working and hopefully there will be great opportunities for us to expand our fishing and for people to get out on the Gulf.”

Robert Turpin, Director of Marine Resources for Escambia County.
CREDIT ESCAMBIA COUNTY

“The end of the contract is June of 2019; however, it’s very likely that the construction will be completed well before that cutoff date,” said Robert Turpin, Escambia County’s Marine Resources Director. He says the structures will help increase fish populations using 21st century materials and deployment techniques.

“Cured concrete that is stable and durable,” said Turpin. “Some of this has limestone that is actually embedded into the concrete, which provides for a more natural sub-strait for attaching and boring organisms.”

As part of the project, there also will be an upgraded interactive map of area reef sites showing both reef modules and shipwreck sites through Google Earth; and a new app for GPS units.

“We also have the coordinates in a GPX format that is available for most of the newer GPS units,” said Turpin. “Where you can simply upload the coordinates in your GPS unit, instead of the old-fashioned way where you had to literally punch in the numbers one at a time.”

Meanwhile, construction is underway at the new Three Mile Bridge site, including plans for lead contractor Skanska USA to take down the old span. Turpin is hoping that those materials can be used to improve the reefs made from the remnants of the I-10 Bridge that was replaced after being destroyed by Hurricane Ivan.

“Skanska was one of the contractors that replaced the I-10 Bridge,” Turpin said. “So they know reefing of those materials is fast. And we’ve made it even faster, more efficient, therefore cheaper for them to do the same thing with the Three Mile Bridge rubble.”

As mentioned, Santa Rosa County is also building its reef program. According to the Pensacola News Journal, the county has about $1.2 million in the bank for additional modules at a snorkel reef off Navarre.

 This story originally aired on February 21, 2018. For more habitat articles go to Fishiding.com

Ottawa pledges $284 million to expand protections for fish habitats

Ottawa pledges $284 million to expand protections for fish habitats

WATCH ABOVE: The federal government has pledged to “restore lost protections” for fish habitats that were lost under the Harper government with a $284-million commitment

The federal government will spend $284 million over the next five years to enforce new laws protecting habitat wherever fish are present, Fisheries Minister Dominic LeBlanc says.

A number of amendments to the Fisheries Act were introduced in the House of Commons Tuesday morning to expand the reach of a prohibition against anything that alters or impacts fish habitat to all waters where fish exist.

Changes to the act in 2012 meant the protections were enforced only for fish listed in provincial registries as being part of commercial, recreational or Indigenous fisheries.

Officials with Fisheries and Oceans Canada said in Ottawa today the 2012 changes resulted in a lot of confusion about exactly what projects would require a federal government assessment, because it wasn’t always clear which fish needed protecting and which didn’t.

The government intends to produce regulations that will spell out exactly which projects will require a federal assessment and ministerial permit to proceed and which will not. The department is consulting on those regulations now.

As well, any reviews done will be captured in a public registry so the public can see the results of every review, something that is not required now.

The act also will require the minister to take into account Indigenous knowledge and expertise when it is provided and all decisions must take into account the possible impacts on Indigenous rights. However that knowledge will be protected from being revealed publicly or even to a project’s proponents without explicit permission from the Indigenous community or people who provided it.

The $284 million will be allocated to help implement and enforce the new law, including hiring new fisheries officers to enforce the act and educate people about it, however officials say there are no details yet about how many will be hired and when.

The legislation also will make it illegal to capture whales, dolphins and porpoises in Canadian waters for the purpose of keeping them in captivity. Officials say existing permits for such activities will be honoured, but in the future only animals captured because they are in distress, injured or in need of care can be held in captivity in Canada.

The amendments to the Fisheries Act are part of a package of government changes to the federal environmental assessment process and fulfills a mandate item issued to LeBlanc when he became the minister.

The bill will be followed later this week by another one that will overhaul the National Energy Board, as well as revise the Navigable Waters Protection Act.

Martin Olszynski, a University of Calgary law professor who worked as a lawyer for the Department of Fisheries and Oceans between 2007 and 2013, said the 2012 changes made to the Fisheries Act differentiated between fish that matter and fish that don

“More substantively, it signalled to a lot of people in Canada that suddenly this prohibition didn’t matter,” Olszynski said. “So you had what was already a very under-regulated issue which impacts fish and fish habitat mostly as a result of resource development becoming that much less supervised.”

He said after the act was introduced the number of projects referred to Fisheries and Oceans Canada for assessment was cut in half. Officials expect the number of referrals and project reviews will go back up, but they said it’s too early to say how many more assessments will be done.

There have been between 80 and 400 reviews in recent years. Lots more habitat news at fishiding.com

The government has been studying these changes since 2016, with online consultations, meetings with Indigenous communities and governments and a study by the House of Commons fisheries committee.

ARTIFICIAL FISH HABITAT OR FISH ATTRACTORS, WHICH DO THE FISH NEED AND WHY?

First off, let’s not continue to confuse fish habitat with fish attractors. There are many substabtial differences between the two and what each product is intended for. Both products attract fish, but only habitat holds the future of fishing.

Log Fish Attractor   Bass on Artificial habitat

Under the Fisheries Act, fish habitat is defined as: “Spawning grounds and nursery, rearing, food supply and migration areas on which fish depend directly or indirectly in order to carry out their life process. (Fisheries Act Section 34(1))”.

Artificial fish habitat as defined above, is simply habitat that is man made with materials not found in nature. Although made from mainly plastics, the intended goal is absolutely the same. Reproduction and protection of more fish.

Fishiding Starter Pack

The planting of native aquatic plants, installing brush, rock, deadfalls and timber would be considered supplemental natural habitat. These types of materials succeed in replacing natural materials that have decayed or have been lost to siltation, erosion and development, but were once present.

Artificial fish attractors attract larger fish and little more, accomplishing the intended task as designed. Open in design and able to see through, generally tubes and sticks that are easy to get fishing lures around, they attract larger fish to a designated area for a short time in transition between cover, made for fisherman to enjoy. One job well done when placed and designed in such a manner that the desired species of fish feel comfortable using it. More at fishiding.com

Read the full story here……….

NFWF awards Seneca Nation grant to stabilize shoreline, creating fish habitat across miles of the Allegany Reservoir

Silt and sedimentation are clogging our nation’s waterways and reservoirs. Years of fluctuating water levels, erosion, development, nutrient loading and decomposition of natural materials, have put these waters in dire need of improvements. Fish habitat, which includes habitat for countless other equally important aquatic organisms, lacks to the degree on many U.S, waters, that no amount of fish stocking can improve the fishery. Without adequate habitat, the fish simply cannot survive.

Sedimentation fills mouths of bays
Sedimentation fills mouths of bays

I met Shane Titus, Seneca Nation of Indians Fishery manager over three years ago as we began to talk about fish stocking, fluctuating water levels and ways of improving overall fish habitat on the Allegany River/Reservoir. Shane contacted me directly to understand more about our artificial habitat products and working together with ways to improve his local conditions. Here is a man with a unique perspective on Tribal rights as well as American U.S./State policies. Proudly having an Indian mother and Italian father, his gentle blend of both “sides”, make it evident that he is a special and highly qualified man for this job. His utmost concern is for the land, waters and the creatures within, helping sustain this natural environment, which breathtakingly surrounds himself and his people in western New York.

Allegany Reservoir
Allegany River flowing into the Allegany Reservoir through western New York’s Seneca Nation of Indians Reservation land.

Shane understands the benefits of adding habitat. He has installed habitat structures in the reservoir for many years and has a quite impressive reputation as a fisherman. “Because the reservoir is so lacking of good habitat, almost anything you add will usually hold some fish.” Prime habitat for all animals, including fish, focuses around diversity. All of the same is rarely best, no different than we humans see things. A less stressful environment grows healthy beings and fish health also is directly related to the stress they encounter surviving from fry through adulthood.

Silt clogs allegany shallows
Silt clogs Allegany Reservoir/ river shallows

To best understand a healthy fish habitat, imagine a large tract of mature hardwood forest, noticing the plants from tiny grasses and ferns, up to shrubs, bushes and trees. Countless shapes, textures, densities and elevations provide unlimited choices of surroundings, depending on creatures needs. Tiny bugs and insects, utilize the fine forest floor, hiding and grazing on the abundant food available. Birds eat berries and some of those bugs, from the lower branches of bushes and undergrowth, while they defensively watch for danger from above or below.  Deer, rabbit, and other small game enjoy the shade from the undergrowth as they hunt or rest. The bigger the tract of forest, the more variety and abundance animals it can/will sustain. Fish habitat is no different than a mature and healthy forest, requiring infinite variety to support diversity and abundance.

Unlimited detail, textures, shapes and sizes of habitat within a forest setting.
Unlimited detail, textures, shapes and sizes of habitat within a forest setting.

Increasing fish habitat groupings on a large scale creates unique areas and corridors for fish to flourish and increase in numbers, not simply attracting a few fish to the area for potential fisherman/predator fish to enjoy.  The surface area of the habitat grows the food (periphyton) with more area being best and essential to a healthy eco-system. Tight, dense shaded areas are essential for small fish to hide and graze within the protection the substrate offers. Dense, ultra-fine cover at the water’s edge restores the once healthy mass of roots and aquatic plants, grasses and invertebrates that young fish need. Natural weed beds and large rocks once provided this surface area for periphyton and algae to grow, but now they have been lost to sedimentation.

Fish congregate around habitat with food source and cover.
Fish congregate around artificial habitat with food source and cover.

Titus was instrumental in obtaining a grant to help construct a new fish hatchery on the Reservation a few years back, which is now pumping out walleye and smallmouth fry annually for the Allegany.

Seneca Nation Hatchery
Seneca Nation Hatchery

His next goal was to get the financial help needed to begin to reclaim areas of the Allegany Reservoir that had been degraded. “We have almost no shallow cover left for the fry, due to erosion and siltation. Bays that lock in fish as they lower the water levels, killing everything left. We need to scoop that stuff out so they can navigate in and out like they used to be able to.”

siltation causing fish kills
Siltation causing trapped fish resulting in massive fish kills.

As Shane continued to follow up on applications for various grant opportunities, our plans to work together to improve conditions on the Reservoir within the Reservation began to take shape.  In late summer of 2014, notification was received of a grant award to the SNI from the National Fish and Wildlife Foundation being part of the Hurricane Sandy Coastal Resiliency grant funding. I got the call from Shane that his application was approved and how he was not only grateful, but quite humbled. “Our people could never have been able to afford and accomplish so much, so quickly, on a scale of this size.  This will make a huge, positive impact on the fishery across miles.”

Alleganny Reservoir
Siltation creating barren underwater landscape.

Plans were made to drive the 600 miles out to review the site, along with numerous models of our Fishiding artificial habitat. Decisions were to be made as to which artificial habitat models would be best, where the grouping would go and the overall quantities involved.

Fishiding.com produces artificial fish habitat from reclaimed PVC vinyl siding contained in a weighted base. Models from 18” tall up to 15 feet create unlimited variety, textures and densities of cover, creating a truly natural underwater landscape for aquatic life to thrive within. Over 2300 units consisting of five different models were selected totaling over 64,000 sq. ft. of surface area, ranging from 48”x84” to 18”x30” in size.

Means being used to document the habitats ability to provide sustainable habitat and deter erosion are by way of sonar equipment, water quality testing, underwater cameras and scuba certified staff. We (SNIFWD, USACE, USFS, and PAFBC) will be looking for signs of life such as invertebrates, algae growth, insect life, eggs of all life (insects, fish, amphibians, etc.) and any species of fish utilizing the habitat for shelter and food for research purposes and decision making for future habitat projects.

Fishiding habitat holding eggs
Fishiding habitat holding eggs

“It’s a no brainer as I see it,” said Titus. “Using this safe, durable, long-lasting material for fish habitat instead of buried in landfills, is a win for the people, fish and the environment. We can grow that stuff right into the shoreline, creating fry habitat and stabilizing the bank at the same time. We can plant them like balled bushes and watch them grow with life each year.”

areas to be included in habitat restoration effort of SNI
Areas to be included in the Allegany Reservoir Restoration and Resiliency Project

I was welcomed by Shane and the team of conservation officers at the Fish and Wildlife Department who proudly work to sustain this pristine land they call home. A first-hand view of the Reservoir in November, Shane showed me the areas that we had talked about, in dire need of restoration.

We walked the river edge, casting jigs for some feisty walleye and smallmouth, catching a few and releasing them back to swim away. “ I keep a couple here and there, but they still feel like my babies” Shane explained, after raising and releasing hundreds of thousands of fry from the SNI Hatchery facility he operates on the Reservation,  releasing them into the Reservoir. He showed me areas devoid of cover, after erosion and low water had worn away the plants, depositing sediment where rock/rubble once exposed. Huge bays landlocked, explaining how many fish die each year, being stuck with no way out as water levels drop, despite volunteers and staff netting and saving thousands of fish each season. Water marks so high, trees and plants were washed away, only to leave the water’s edge barren for fish to contend with in the spring as they attempt to successfully spawn.

Barren shoreline
Low water exposes a barren litoral zone along the Allegany River/Reservoir.

Needless to say, excitement grew with the dream of being able to work along the river on a very large scale. To install thousands of individual habitat units creating tens of thousands of square feet of surface area would boost the fishery measurably. Concentrating on shoreline stabilization and fry recruitment, all targeting depths from 6 feet of water and under for the little fish, bugs and plant growth. Another additional benefit of large groupings of habitat is the excrement discarded by the fish and creatures that inhabit it fertilizing plant growth. Clearly aquatic growth, grass and weeds take root in the surrounding lake floor, being fertilized by the fish from above. Another win-win for the fish and the environment.

bass on fishiding habitat
Bass on fishiding habitat

Project Abstract

The goal of this funding through established partnerships with the PAFBC, USFS, ACE will be to restore the habitat within the reservoir and create an enhanced water system that can tolerate high water events with minimal loss to wildlife and habitat.

The Seneca Nation of Indians has a long history of struggling to maintain its land base and yet there remains a unique and harmonious relationship between indigenous people and the concept of environmental sustainability. The Seneca people believe fully in the tenet of their forefathers, that everyone must plan for the future generations, up to and beyond the seventh generation. The current conditions that exist within the Allegany Reservoir create an intolerable struggle within the people as they are forced each year after year to witness thousands of fish dying, species disappearing or become species of concerns, a vital wildlife habitat lost. Over the past 60 years this reservoir has had numerous high water systems into the reservoir, suffocating aquatic species. Each event results in species lost, habitat lost, channels filled and community flooding.

The people of the Seneca Nation live and work on the same lands today that the Seneca people have inhabited for over 1000 years. The Seneca Nation holds title to five distinct but non-contiguous territories located in western New York, an area of the state where communities are primarily rural in geographic location. The territories are unique in its economic, social and environmental profile. With 53,884 acres, the Seneca Nation controls and holds a significant land base in western New York.

“The Allegany River/Reservoir Restoration and Resiliency Project”

Objectives/Outputs/Outcomes:

  • Create a healthier habitat for aquatic species within the Allegany Reservoir
  •    10 acres will receive in stream habitat restoration efforts.
  •    50 acres will benefit from artificial and natural habitat structures.
  • Enhance the flood plain and habitat restoration of the Allegany Reservoir through riprarian buffer restoration.
  •    18.94 miles will have large debris removed from shoreline area.
  •    10 acres will receive indigenous plantings.
  • Restore hydrology to land locked areas of the Allegany Reservoir.
  •    7 land locked areas will be reconnected to the Allegany Reservoir.
  •    15 acres will be cleaned of sediment, silt and nutrients.

The habitat has been delivered and equipment is in place. Over the next two years, Shane and his team will work all year around, improving the many areas covered within the grant. A great deal of the work will be during the winter months, when water levels are down and lakebed areas exposed. The team will use an earth auger to drill/install the many pole clusters to be installed to regain a plant base in the many washes, streams and creeks flowing into the reservoir. These barriers will catch debris during runoff, creating a medium for plants to begin to take hold. Dozers, trucks along with a good amount of manpower will begin to remove the 1000’s of cubic yards of sediment from the bays and openings, allowing the fish to again, freely pass.

Fishiding.com fish habitat being loaded for seneca Nation Allegany Reservoir Project
Habitat being loaded for Seneca Nation Allegany Reservoir Project

The artificial habitat units will be planted individually in shallow, drilled holes and backfilled like a balled bush. Planted in large clusters, these units will become exposed each year as the water levels drop in the fall, but take on new life each spring as water levels rise and fish move in to seek spawning protection. Not only will the shallowest models protect fish, but allow shoreline plants and their roots to attach and take hold, strengthening and buffering the eroded shallows. With this substrate in place, only good things follow.

Shallow Cradle model by Fishiding.com
Shallow Cradle model for fry and shoreline stabization

Late in 2014, the Seneca Nation hosted its third annual “Allegany Reservoir Management Meeting”. Agencies that are represented at these meetings are: SNI Fish and Wildlife, SNI Administration Representatives, Pennsylvania Fish and Boat Commission, New York State department of Environmental conservation, US Army Corp of Engineers, ( KInzua staff, Pittsburg District), US Fish and Wildlife Service (Tribal Liaison, Great lakes rep., Hatchery  Lamar PA, and Hatchery Kinzua PA), US Forest Service and California University of Pennsylvania. Topics discussed at these meetings are all the topics mentioned in the grant, plus stocking strategies, fish sampling surveys, fish pathology and funding opportunities. These “first of their kind” meetings are a shared water body being managed as a single water body.

Aquatic species that will benefit from the habitat are: Walleye (tribally significant species to Seneca culture and heritage) Smallmouth Bass, Large Mouth Bass, Black Crappie, White Crappie, Paddlefish (endangered), Northern Pike, Muskellunge, White Bass, Yellow Perch, Bullhead, Channel Catfish, Sunfish, Rock Bass, Sucker, Emerald Shiner, Golden Shiner, Fathead minnows, Spot Tail Shiner and Bluegill, Fresh Water Jelly fish, Aquatic spiders and Macro invertebrates.

Wildlife also benefitting from the habitat: Bald eagle, Golden Eagle, Cormorants, Loons, Ducks (all species), Canadian Goose, Osprey, Green Heron, Blue Heron, Snapping Turtle, Painted Turtle, Leather Back Turtle, Hellbender (amphibian, species of concern) and River Otter (species of concern)

Increased stewardship among the Seneca community will be an immeasurable benefit of this project. The SNI Fish and Wildlife Staff provide educational programs directed at youth to teach them about the environment and its importance to the health of all fish and wildlife. The SNI Fish and Wildlife Department plans on using these projects to create a three year educational tool for the youth and general public. The Seneca nation newsletter will be doing periodic articles to keep the public informed and involved in all aspects of the projects, to include the purpose, reasons, and outcomes of the work.

For more information regarding Reservoir habitat restoration, funding and other projects taking place, visit Friends of Reservoirs, which SNI Fish and Wildlife and Fishiding strongly support. Friends of Reservoirs (FOR), is a tax-deductible non-profit foundation dedicated to protecting and/or restoring fisheries habitat in reservoir systems nationwide. FOR is the funding arm of the Reservoir Fisheries Habitat Partnership, an organization of natural resource professionals and industry representatives, associated with the National Fish Habitat Partnership. FOR is also a coalition of local citizen groups dedicated to improving fish habitat in reservoir systems. David Ewald/ Fishiding.com

Underwater photography by Eric Engbretson, all rights reserved. For a complete library of Fishiding habitat underwater in various locations and conditions see Eric’s work here. Watch for much more information, photos and reports as this project gains momentum. We will be making many trips back to see Shane and his crew improving conditions on the Reservation. Fishing poles and tackle must be present for “testing”.

Rez Fishing

How Lake Ellwood, Once Doomed Is Being Rescued

BACK FROM THE BRINK

How Lake Ellwood, Once Doomed Is Being Rescued

By Eric Engbretson, Engbretson Underwater Photography

Black Crappie C-843

Imagine a town consisting entirely of seniors. The town has no children, no teenagers, and no young adults. All the schools, playgrounds, and sports fields have closed. The town is eerily empty and still. And every year, as seniors pass on, the town’s population grows smaller and smaller. With no young people to replace the departed, the town will simply disappear from the map. A grim future indeed.

Until last year, this same sad demise seemed destined for Lake Ellwood in Florence County, WI.  In its waters, bluegill and largemouth bass had grown old. For the better part of a decade, no young fish were surviving to replace them. But now it seems that a corner has been turned and the news is good.  Today, Ellwood is a lake on the brink of recovery.  The story of the lake’s resurrection is a tale that involves invasive plants, a dedicated fisheries biologist, and a host of scientists working against the clock to save a small but beloved piece of Florence County.

THE CRASH

A healthy lake gets a steady stream of newborn fish every year, and the newborns that survive to maturity constantly enlarge the adult population. Fish biologists call this process recruitment. Of all native fish, largemouth bass and bluegill are both extremely prolific and they have shown outstanding talent for recruitment. Unlike walleyes, which require very specific conditions to reproduce, largemouth bass and bluegills thrive even when conditions are far less than ideal. Typically, when two years pass without largemouth bass and bluegill recruitment, fish managers become concerned, and Lake Ellwood has now seen seven consecutive years with failed recruitment.  Dr. Andrew Rypel is the state’s lead panfish researcher for the Wisconsin Department of Natural Resources.  “It’s an eyebrow-raiser to be sure. What’s happened on Lake Ellwood has gotten our attention.  It’s very weird.”

Greg Matzke is the DNR’s senior fish biologist for Florence and Forest Counties. When I visited him in his office at the Florence Resources Center a year ago, he was eager to discuss Lake Ellwood.  “The fisheries biologist position for Florence was vacant for three years prior to my arrival,” he told me. “By the time I got here in year 2010, many of our lakes hadn’t been surveyed in a while.  When we got around to looking at Lake Ellwood in 2012, the fish population hadn’t been surveyed for a decade. What we found was a lake with few young fish. By the end of our spring survey it was clear to me that something was wrong with some of the major fish populations in Lake Ellwood.”  What Matzke documented in 2012 was an almost total collapse of the fish community. In Wisconsin, a failure of this magnitude in largemouth bass and bluegill recruitment is utterly unprecedented.

Matzke typed excitedly on his keyboard as a graph flashed onto the screen. Compiled from the data he had collected, the graph showed a sudden drop in northern pike recruitment after 2004, followed by bluegill and largemouth bass recruitment failures after 2006. Northern pike and largemouth bass recruitment had not occurred at all since 2004 and 2008 respectively, while bluegill recruitment fell off and became insignificant after 2006. “We surveyed that lake extensively, with 44 fyke net lifts and 7 complete electrofishing surveys totaling 20.22 miles (on a lake with 2.8 miles of shoreline) and couldn’t find a single fish younger than five, six and eight years of age, for largemouth, black crappie and northern pike. Not one.” said Matzke. “Nobody has ever seen anything like it.” In total Matzke spent 19 days surveying the fishery in one small lake, which is a great deal of time and effort, and I wondered how many lakes earn such scrutiny. “Not many,” said Matzke. I asked the big question: “What happened to the fish?” He paused and exhaled. In a reflective mood, he lowered his voice: “At first I had no idea, but after gathering and analyzing all the data it’s quite clear…. I believe it has to do with the milfoil treatments out there.”

THE MILFOIL CONNECTION

In the bars of Spread Eagle, fishing is a hot topic among the locals. It fills the air in the summer months, when local businesses are booming and lakefront owners are spending more time on the water.  Between rounds, someone mentions the fish crash in Lake Ellwood, and explanations flow like beer from a freshly-tapped keg. On a steamy night last July at the Chuck Wagon Restaurant, the fate of the lake engaged almost every person in the room. Barroom biologists blamed culprits ranging from low water levels to fish cribs and even invasive Eurasian watermilfoil (EWM) sucking the oxygen out of the lake.

Back in their offices, Matzke and his colleagues considered these possibilities and decided none of them were credible because these same conditions exist on hundreds of lakes throughout Northern Wisconsin, and none of the lakes has shown collapses in fish as was documented in Lake Ellwood. In their opinion, the crash stemmed from chemical herbicides applied to control the invasive plant Eurasian watermilfoil.

Eurasian watermilfoil (EWM) was discovered in Lake Ellwood in 2002. Treatments started during the next spring. The Lake Ellwood Association contracted with a lake management firm to monitor and treat the lake every spring thereafter with very good success. As chemical treatments continued, invasive plants began to subside.  Encouraged by their success, the lake association continued treatments in the hope of eradicating small but persistent areas that would materialize.  An unintended consequence was that native plants were also being killed by the herbicide.

Once considered the most crucial problem facing the Lake Ellwood Association, milfoil has now taken a back-seat to the lake’s most urgent issue:  The fish crash.  It was a shift in priorities that took time to embrace.  Matzke recalls that “when it came to Lake Ellwood, too many people were focusing on the wrong thing.  In the beginning, when I told them about the fish crash, they listened, but still seemed more concerned about the milfoil.  I explained that milfoil was not the biggest problem.  A milfoil-free lake is worthless as a fishery if it can’t sustain healthy fish populations.”  Many people were still talking about invasive species ruining the lake when it was losing its fish at an alarming rate.  “We needed to do something to encourage fish recruitment before it was too late.”  Despite being alerted to the collapse of the lake’s fishery and a hypothesis that linked the crash to the milfoil treatments, in the spring of 2013, the Lake Ellwood Association applied for their annual permit to continue chemical treatments.  The news of the disappearance of what was once a balanced, self-sustaining, and vibrant fish community had seemingly fallen on deaf ears.  Matzke, along with WDNR water regs staff, denied the permit application.  He defended what was an unpopular decision at the time by saying, “We need to take a time-out and find out what’s going on in this lake. It’s not a stretch to suggest that the milfoil treatments may be doing more harm than good.”  At first, many were unconvinced that any connection existed, but since then, those who have studied the data compiled by Matzke admit that the evidence is hard to ignore.

So how could treatments aimed at invasive plants be hurting Lake Ellwood’s fish?  The exact pathways behind the crash are still being investigated, but two plausible reasons might explain why multiple fish species have failed to recruit.  One is that the chemicals disturb the aquatic insect community that young fish need for survival, and the fish literally starve to death in their first few months of life.  Another theory that holds more water is that the chemical herbicides have depleted too much of the lake’s native plant community that young fish need for refuge.  Without dense plant beds to hide in, young fish may be preyed upon by larger fish, and by the fall, entire year classes of fish are gone with no survivors to contribute to the lake’s fish community.  It could also be a combination of both of these scenarios.  While it’s unknown exactly how the fish crash happened, it’s clear that the chemicals played a key role.  Native vegetation is critical to fish.  There are many examples illustrating this important connection.  On other Wisconsin Lakes, the loss of native vegetation has proven to be the cause behind similar crashes of largemouth bass and bluegill populations.  In those lakes, rusty crayfish or common carp were responsible for removing too much native vegetation, causing largemouth bass and bluegill populations to collapse.  On Lake Ellwood, the same thing has happened.  But on this lake, humans, using herbicides, are behind the loss of native plants fish need.

Dr. Andrew Rypel, Wisconsin’s leading panfish researcher, says that the complex relationship bluegills have with plants are just beginning to be understood by fish scientists.  “We’re trying to understand how this occurred and we’re looking at other water systems with aquatic plant management programs around the state to see if this is an anomaly.”  He added, “With bluegills, we know habitat is important.  In fact, for the first time, we’re really starting to study how plants affect fish quality”.

Is there a way to save the fish, preserve native plants and still limit invasive milfoil?  “Yes,” says Greg Matzke, “But not with continual use of chemical herbicides.” Denied permits to use any further chemical herbicides, the Lake Ellwood Lake Association cleverly looked to alternative methods of milfoil removal.  Last summer, they contracted with an Iron River company, Many Waters LLC, to use Diver Assisted Suction Harvesting (DASH) as an alternative to herbicides.  The DASH system features a giant vacuum cleaner atop a pontoon. At the bottom of the lake, scuba divers use their hands to pull out invasive milfoil (and avoid native plants) and then feed it into a tube that takes it to the surface for collection and removal. Unlike chemical treatments, DASH acts selectively by focusing only on milfoil and leaving other plants generally undisturbed.  Matzke gave his warm approval to DASH: “We need to preserve and expand native plants in Lake Ellwood for fish to have a chance at survival. The DASH system removes milfoil without harming the native vegetation essential to fish.” Early results appear encouraging:  In the summer of 2013, DASH took more than two thousand pounds of milfoil out of Lake Ellwood.

 HOW BAD ARE INVASIVE PLANTS?

Dr. Jennifer Hauxwell is chief of fisheries and aquatic sciences research at the Wisconsin Department of Natural Resources.  Headquartered in Madison, her team of scientists have been studying Eurasian watermilfoil for ten years.  What they’ve discovered so far is that EWM is tough to pin down.  It doesn’t seem to behave in any two lakes quite the same way, and there’s no way to predict if it will peacefully co-exist with native plants as it does in most lakes or reach overabundance as it does in others.   Hauxwell says, “In some lakes EWM never ‘takes off’ or expands to levels requiring any management.  In some lakes EWM is a major component of the ecosystem and may provide structure/habitat complexity if native species diversity is low or absent.  In some eutrophic to hyper-eutrophic lakes EWM may be the only species keeping the lake from turning to algae dominated.” Hauxwell says her team has found other cases where it’s proven beneficial.  “Lake Wingra, once suffered from murky water due to algal blooms and lots of suspended sediment”, says Hauxwell.  “When carp that root up sediment were removed from the lake, the water cleared, and light was available to support plant growth. EWM quickly expanded in the lake and helped further clear the water and keep algae and suspended sediment low. It’s now a recreational nuisance, but it’s definitely playing an important ecological role in the lake community.”   Currently, EWM occurs in 4% of Wisconsin’s lakes mostly in small colonies that are not problematic.  “Our researchers quantified the amount of EWM in approximately 100 EWM lakes to get a sense for how widespread it may be in any given lake and across different lakes.” Says Hauxwell.  “We found that there was a wide range in abundance.  In the majority of the lakes we studied, it was sparse and occurred in less than ten percent of the inhabitable zone.” When does it reach nuisance level, I wondered? “’Nuisance’ is very difficult to define, and it’s in the eye of the beholder”, says Hauxwell.  Her team is excited about a plethora of research studies currently underway that will shed even more new light on this enigmatic species.

Mike Vogelsang is the DNR’s fisheries supervisor for the Woodruff area and oversees all fish management in six counties in Northern Wisconsin, including Florence.   He’s more concerned with the chemicals used to control EWM than with the invasive plant itself.  “There’s some real questions by our biologists, since they’re the ones required to review, and ultimately approve chemical application permits.  What are the effects of chemical use going to be twenty years down the road?  We’re already finding that in some cases they don’t break down as quickly as believed-they have toxicity long after the manufacturers say they do.”

Vogelsang also says that because it’s expensive to control and impossible to eradicate, learning to live with milfoil is inevitable.  “Where are we really going with these treatments?  When do they become excessive?  What effects are they having on fish communities?  These are some of the questions we’re talking about now.”  Vogelsang isn’t satisfied that EWM is the destructive threat that’s worthy of all the resources directed to control it.  “When EWM first came on the scene, there was a lot of fear associated with the plant, because it was a new potential threat, and the Department wasn’t sure if it would negatively impact our waters.  To help stop its spread, there was a lot of gloom and doom talk with lake associations and the general public.  We heard all these things about exotics and how bad they are, but it hasn’t been the end of the world.  The sky didn’t fall.  In many lakes, fishing got better with the invasives.  I’m not saying exotics are a good thing – and we should do everything we can to prevent their spread – but EWM hasn’t impacted our fisheries.”

Is an unwarranted level of fear driving lake associations to respond too aggressively to milfoil?  If so, it’s a fear that today feels like an over-reaction to a plant that now doesn’t seem to be capable of ruining lakes after all.  Ironically, while EWM hasn’t harmed fisheries, the unintended consequences of using chemical herbicides to control it has, as it did on Lake Ellwood.  Is what happened on Lake Ellwood an indictment of chemical herbicides?  “When over-used, I think so.” Says Vogelsang.  “It’s simple: No weeds equals no fish.  If I had my own private lake and it got milfoil, would I attempt to control it with chemicals?  No.  I would leave it alone and know that eventually the plant would become naturalized with the native plant community – like it has on many lakes where no chemical treatments have been used.”

Steve Gilbert, another fish Biologist, echoes Vogelsang’s observations.  He reports that for the past 22 years that he’s worked in Vilas County, the negative impacts of EWM on fish in Vilas County lakes has been zero.

While the DNR has consistently denounced EWM, new plant science and testimony from fisheries managers now seem to undercut the agency’s long-standing rhetoric. The days of demonizing Eurasian watermilfoil may be nearing an end.  Stated simply, EWM is not be as bad as we formerly thought. It’s a tough bell to un-ring and DNR insiders are struggling to navigate the complicated path to this more moderate public position, without undermining their credibility.

THE FISH RETURN

May 2014.  A year has passed since my last meeting with Greg Matzke and I’m back in his office to discover what has happened with Lake Ellwood since we last talked. The spring of 2013 was the first year in a decade when chemicals weren’t applied and the results were instant and dramatic.  Grinning now, Matzke tells me that his fish surveys from the fall of 2013 show an astounding thirteen-thousand percent increase in young-of-the-year bluegill since 2012 (the last year of chemical treatment).  The 2013 survey also found young-of-the-year largemouth bass, which makes the 2013 year class the first successful recruitment of this species in Lake Ellwood since 2008. In fact, largemouth bass recruitment in 2013 was measured at a rate more than double the recruitment level in 2002 (before chemical treatments began). This immediate rebound adds solid weight to the theory that herbicides did indeed cause the famous collapse in the fish community. A thirteen-thousand percent increase in bluegills sounds incredible and I asked Matzke to put the numbers into context. “We captured just over 97 age-0 bluegill per mile during our electrofishing survey; this is up from less than one age-0 bluegill per mile in 2012. The 2012 year class still looked poor with only 0.67 age-1 bluegill per mile during the 2013 survey.  For the first time in a long time, conditions are acceptable for bluegill and largemouth bass to reproduce successfully. And they’re responding.”  Putting the question as directly as possible, I asked if it was simplistic to think that “no plants equals no fish” and that “with plants, we have fish.” Matzke said, “That’s an interesting point. I mapped out the aquatic vegetation in Lake Ellwood during August 2013 with acoustic equipment to get a picture of the plants.” Showing me a multicolored map of the lake, he pointed to red-shaded areas that contained the most concentrated areas of plants. “We didn’t find a dense plant community by any means, but in certain near shore areas, there was dense plant cover where there hadn’t been any before.” Matzke draws an optimistic conclusion: “This suggests that for bluegill and largemouth bass recruitment, overall plant abundance may not be as important as these narrow strips of dense aquatic vegetation that are now found in Lake Ellwood after the herbicide treatments have stopped. These areas serve as great nurseries for young fish, offering preferred prey items and cover from predatory fish, giving bluegill and largemouth bass a fighting chance to recruit.”

When news of the Lake Ellwood fish crash started to spread, says Matzke, “I started getting calls. Other fish biologists from around Wisconsin, Michigan, and Minnesota had heard about Lake Ellwood and they were looking for more information.” They were consulting Matzke to learn about signs of incipient problems in their own lakes. Matzke also took “calls from regular folks around the State” who lived on lakes with invasive milfoil and who worried that chemical treatments were hurting fish populations in their waters. Was the same thing happening to other lakes? Matzke shrugged: “It’s really hard to say. To know for sure, you need to steer your sampling efforts to target young-of-the-year panfish. That’s not something fish managers typically do in their ordinary work.  Unless you’re specifically looking for it, it’s the kind of problem that could go undiscovered for a long time and may go unnoticed until the adult population begins to be effected, as it did on Lake Elwood”.

Now retired, fisheries biologist, Bob Young oversaw Florence County Lakes from 2000-2007.  He fondly remembers Lake Ellwood as once being a high quality panfish lake.  He’s been following the recent changes closely and feels another important lesson can be learned.  “The invasive species folks should be working closer with fish managers so they can avoid situations like this. I’ve always been uneasy with the notion that total chemical war needs to be made on any and all invasive plant populations. Maybe it wasn’t the best thing for Lake Ellwood.”

A PROMISING FUTURE

Events in Lake Ellwood have also drawn the attention of the Dr. Greg Sass.  Sass is another member of the DNR’s elite Fisheries and Aquatic Sciences Research Section. As the agency’s equivalent of a CSI unit, these fish detectives answer calls to solve the most perplexing mysteries in the fisheries of the State. They’re the team whose groundbreaking scientific work in many areas over the years have directly led to major improvements in Wisconsin’s fishing.  Sass visited Lake Ellwood in 2013 to investigate and define the forces behind the crash in the fish community.  His ongoing study will gather more data not just from Lake Ellwood, but from two other lakes (Cosgrove, and Siedel) in Florence County.  Sass is hopeful that eventually his team will be able to mechanistically explain the bluegill and largemouth bass recruitment failures observed in Lake Ellwood.

In Florence, meanwhile, Matzke says his office will continue fish surveys to monitor the recovery now underway.  He remains optimistic about the future (which doesn’t include any further chemical treatments for Eurasian watermilfoil.) “It’s my hope that we can come to a clear understanding of the things that drive natural reproduction of the fish in Lake Ellwood.” Turning to the crash in the fish community, Matzke expressed his hope that “we can plausibly explain how the fish community crashed. So far the signs are quite clear; it was the treatments to eradicate milfoil—not the milfoil itself—that have seemingly indirectly caused the collapse in fish recruitment.”  Lake Ellwood still has a few acres of invasive milfoil and likely always will.  But native plants as well as young bluegills and largemouth bass are beginning to return.  For fishery managers, that makes for a tradeoff with the sweet taste of victory.

Let’s go back to that town you imagined, the place where every citizen was a senior. The place is turning robust, as a new cohort of kids has taken to the playgrounds, sports field, and schools. “That’s not the same as a town with a lot of young adults,” cautions Matzke, “but it makes for a promising start.” At this time, the Wisconsin DNR’s careful work seems to justify the same spirit of cautious optimism about the future of Lake Ellwood. More habitat articles at fishiding.com

(For further information, questions or comments about this article, please email Greg Matzke at Gregory.Matzke@Wisconsin.gov)

Insufficient fish habitat protection threatens Alaska’s valuable fisheries

The overreach of executive power

  Klas Stolpe | Juneau Empire

Posted: January 9, 2014 – 12:07am
By LISA WEISSLER
FOR THE JUNEAU EMPIRE

The public interest is no longer being served by Alaska’s natural resources permitting system. When it comes to state resource development decisions, too little voice is given to Alaskans, project reviews are fragmented, local and tribal governments are sidelined, and too much power is concentrated in the executive branch, particularly the Department of Natural Resources.

Resource development projects often involve multiple activities, such as road and facility construction, water use, and material extraction. Each activity requires permits from different divisions within each resource agency. Since permitters act on their permitting authority separately, project reviews are piecemeal, and only public comments related to each individual activity are considered. There is no opportunity to analyze a project as a whole. DNR coordinates large project reviews such as large-scale mining, but this is done mostly as a service to applicants who pay for the privilege. More habitat articles at fishiding.com

Under the Alaska Coastal Management Program, local governments played a significant role in working with the state and federal government on the best way to resolve conflicts between competing resource uses and local values. But with the termination of the program in 2011, local governments are now accorded no more deference in development decisions than the general public.

Insufficient fish habitat protection threatens Alaska’s valuable fisheries. The Department of Fish and Game has just two laws specific to fish habitat, one that prevents obstructions in fish-bearing streams and one requiring Fish and Game approval prior to work in salmon streams. The defunct coastal program addressed other important fish habitat outside streambeds, including estuaries, offshore areas and tideflats. Now, fish habitat protection is mostly within DNR’s discretion as part of their land use permit.

Fish and Game is in the process of changing its special area management plans so that rather than prohibiting certain activities in special areas, the department will have discretion to permit activities without public notice. They also intend on putting multiple plans into a single review packet for public comment once a year, limiting the amount of public engagement on local issues.

Recently passed legislation allows DNR to hold a public notice and comment period only once every 10 years for oil and gas exploration or development in multi-million acre areas. People will be required to comment without knowing the when, where, how, or what kind of exploration or development might occur in or near their community.

The courts are the last check on overreaching executive power. But that’s under threat as well. Gov. Sean Parnell recently brought a lawsuit against respected statesman Vic Fischer and former First Lady Bella Hammond for their public interest challenge of Pebble mine activities.

And things could get worse. House Bill 77, currently pending before the Legislature, will concentrate even more power in the DNR commissioner and further fragment project reviews. It will also make it harder to appeal DNR decisions in court.

Then there’s Administrative Order 266, recently issued by the governor to establish regulatory “efficiency” guidelines. This may result in resource agencies loosening regulatory requirements, such as public notice, to reduce costs for developers.

We need our legislators to act as a check on this overreach of executive power. They should stop or substantially change HB 77, and pass legislation enforcing an Alaska Supreme Court ruling that DNR has a constitutional duty to analyze and give public notice on cumulative impacts of oil and gas projects. The Legislature should also conduct oversight hearings on resource agency regulation changes proposed under Administrative Order 266.

Other ideas to protect the public interest in permitting decisions include:

1. Providing for coordinated project reviews that give the public and local governments the opportunity to analyze projects as a whole.

2. Giving local governments deference on issues of local concern.

3. Increasing statutory fish habitat protection.

Residents can act as well. Tell your legislators you want this administration’s power grab stopped, and help elect a governor who values Alaskans and local and tribal governments as partners in the development of this great state. Contact your legislator, vote, and make your voice heard.

• Lisa Weissler is an attorney with expertise in natural resource law and over 20 years experience with the State of Alaska. She has worked thirteen sessions for the Alaska state legislature; served as an assistance attorney general specializing in oil, gas and mining law and coastal management; and as a special assistance for the Department of Natural Resources and a project analyst for the Alaska coastal management program. She was the policy director for the coastal management program initiative and is currently providing natural resource law and policy consulting services.

Artificial Fish Habitat Teaches Fish Survival Skills

Aquatic Playground Can Turn Water Tanks Into Fish Schools

July 30, 2013 — Raising fish in tanks that contain hiding places and other obstacles can make the fish both smarter and improve their chances of survival when they are released into the wild, according to an international team of researchers. More habitat articles at fishiding.com


“It’s a key problem in that we are very good at rearing fish, but we’re really not very good at releasing those animals in the wild such that they survive,” said Victoria Braithwaite, professor of fisheries and biology, Penn State. “There’s a mismatch between the way we raise them and the real world.”

Juvenile Atlantic salmon raised in tanks that including pebble and rock hiding places and floating artificial plants were better able to navigate mazes and showed signs of improved brain function compared to the salmon reared in standard hatchery tanks, Braithwaite said. This may help conservation fish hatcheries raise and release fish that are better adapted to survive in the wild.

Conservation fish hatcheries raise cod, salmon, trout and other types of fish and release them in places where their species may be threatened, or where their populations are declining.

“The philosophy of most fish hatcheries is to rear a large number of fish and hope some survive,” said Braithwaite. “What this study is suggesting is that you could raise fewer, but smarter fish, and you will still have higher survivability once you release them.”

The researchers, who released their findings today (July 31) in the Proceedings of the Royal Society B, placed pebbles and rocks at the bottom of the tank and added plastic plants weighted down so they would float vertically in the water. Braithwaite said the objects created a more natural, three-dimensional ecosystem.

“In the hatchery the world is homogenous, life is boring and monotonous,” Braithwaite said. “The water flow is the same, you don’t have to find your food and you don’t have to avoid predators.”

The researchers also moved the objects around about once a week during the eight-week study, which took place in Norway.

When the researchers placed the salmon in a maze, the fish raised in the enriched tanks made fewer mistakes when trying to escape the maze, Braithwaite said. The performance of the salmon from the enriched tank continued to improve with each trial, and they learned to solve the maze much faster than fish reared the standard way.

The brains of the fish from the enriched tank were also different from the fish raised in the standard hatchery tanks, according to the researchers.

They noted increased expressions of a gene in a region of the fish’s brain that is associated with learning and memory, an indication of increased brain function and growth. The fish raised in standard tanks did not show this sign of increased brain development.

Interacting with the environment can influence gene expression in the brain, Braithwaite said.

“The brain is a very plastic organ, it’s a dynamic structure,” said Braithwaite, who worked with Ann Gro Vea Salvanes, professor of biology; Olav

Moberg, doctoral student; Tome Ole Nilsen, researcher in marine development biology; Knut Helge Jensen, senior engineer in evolutionary ecology, all at the University of Bergen, Norway; and Lars O.E. Ebbesson, group leader of integrative fish biology, Uni Research, Bergen. Braithwaite said the enriched tanks created significant improvement in the intelligence and adaptability of the fish, but were relatively inexpensive and easy to implement. Owners of fish hatcheries should be able to afford the creation of enhanced tanks.


Story Source:

The above story is based on materials provided by Penn State, via EurekAlert!, a service of AAAS.

Why Fish Cribs Work and Why They Fail

Engbretson Underwater Photography

Why Fish Cribs Work and Why They Fail

This article by Eric is the most comprehensive list and overview of fish cribs and habitat

preferences utilized by most of the North American fish species I have ever come across.

His career spanning over 30 years in underwater fish photography has given him and now us,

a look beneath the waves to understand what he and his colleagues have been seeing for years.

In over four years of extensive study, I have not found anyone else who understands

fish behavior and has the photos to prove his findings like Eric. Groundbreaking

information never before available, will help us understand how to best construct,

place and revitalize new and existing fish cribs and why. Did you know fish preferred

to be able to swim under the crib, not to mention key points like density, height

and proximity to aquatic vegetation? More habitat articles at fishiding.com

Eric and I talk regularly about habitat, cribs and fishy stories surrounding this

underwater world which he is so familiar with. He has installed some of our

artificial habitat units in his own lake for long term monitoring as well as other

lakes in the area to see just how well they stack up. Although skeptical at first,

he has seen the aquatic growth, fry and predator fish utilizing our products and

find we meet most, if not all of his criteria for why our products work so well.

Sit back and read into the underwater world of Eric and his team as they share

their insight of how, why and where fish cribs work from the first hand account

of divers under the surface.

Take a look through his site and the thousands of images he has compiled

over his career under the water’s surface. This is only the start of fully

understanding and improving the fish cribs we install. The Fishiding pictures

he has taken and observed will only help us improve on how best to help our

fisheries. Throughout this diving season, Eric and his team will continue to dive

and document our cribs and others for all to enjoy and learn from. Preferred

crib color, fish abundance, water fertility/clarity and sunlight penetration are just

a few of the many unanswered questions we are beginning to understand with

Eric’s help. Watch for a new, taller model to come out soon!

 

Engbretson Underwater Photography


Why Fish Cribs Work and Why They Fail

By Eric Engbretson

 

When I encounter fish cribs in lakes where I scuba dive, I typically see one of two opposite things: cribs holding fish, and cribs attracting no fish at all. In years of first-hand underwater observation, I have noticed that the cribs with fish share certain characteristics. So do the cribs devoid of fish. I’ve concluded that there are two key aspects of cribs that succeed in drawing and holding impressive numbers of fish. Those two critical components are design and location. Let’s look at each one separately and see why some cribs succeed while other cribs fail.

Design:

Years ago, fish cribs usually shared a single design. They consisted of big logs lashed together to make a cube like a miniature log cabin without a roof. The interior was stuffed with brush or tree branches and they were weighed down with concrete, cinder blocks, or heavy rocks. Since these structures can be very large, heavy, and almost impossible to move, they’re built in the wintertime in northern states and left on the ice, where they sink into place in the spring when the ice starts to melt. The cribs are usually square but sometimes rectangular. They are typically four or five feet high and four to eight feet long.

Since the classic wooden log-cabin style is the most popular kind of fish crib, my observations and comments focus on these specific types of cribs and in particular on the best ways to make them as effective as possible.

By their very nature, most fish cribs have a distinctly limited lifespan. When they’re fresh and their interiors are tightly packed with brush and tree limbs, minnows and juvenile fish will flock their way. The thick cover provides shelter and a place to hide from predators. The smaller fish penetrate deep into the cribs. Panfish will congregate outside or squeeze their way in where they can. Larger predator fish, such as bass and northern pike, will hang around the perimeter, attracted by the throngs of fish concentrated in this area.

The interior material of thick brush or tree branches gives rise to a problem that is endemic to fish cribs. The material provides dense cover that small fish need, but over time it disintegrates, leaving only the cribs’ outside skeleton intact. The center portion remains basically empty. Without brush and branches, the cribs can no longer protect small fish from larger fish. And once the small fish–a source of food–disappear, the crib also loses its appeal to the game fish, which no longer gather around the crib to enjoy the all-you-can-eat buffet it once was. While these cribs might occasionally still draw a few larger fish for shade or cover, they lose their major attraction as a feeding center. Most people don’t understand that the secret ingredient that makes a crib design successful is not the frame or the exoskeleton, but the thick interior brush. If that’s not a central component from the start, or if it’s lost, cribs will stop attracting fish. The frame may stay intact and last for decades, but the brush deteriorates much more quickly. If there were some way to re-stock these cribs with interior brush, we could vastly extend their viability and lifetime.

The Vertical Dimension

Height is infinitely more important than length. The higher the walls of the crib extend from the bottom, the more attractive the crib will prove to fish. You want a piece of genuine structure, not something that is just an inconspicuous component of the floor of the lake. In fact, cribs should measure no less than four feet high. Fish want something well above the lake floor, and they like to choose the depth they want to hold while remaining close to the structure.

One of the best fish cribs I’ve ever seen was created entirely by accident. It was rectangular and four feet high, four feet wide, and 12 feet long. It was placed on the ice in 17 feet of water. When the ice melted in the spring, the rocks weighing it down shifted position, and the crib plunged to the bottom on its side. As a result, the crib towered 12 feet from the bottom. Underwater it looked like a skyscraper. Fish flocked to the crib and occupied various stories from top to bottom. A long, dark shadow fell on one side and served as a magnet for fish. In short, the structure turned into an amazingly effective accidental home. Another crib of the same dimensions fell nearby as originally intended but, since it ranged only four feet from the bottom, it attracted only a fraction of the fish the skyscraper did.

Complexity of Design

Since this is not an article about building cribs, I won’t go into the blueprints on how to construct them. The key element in one word is complexity. This refers to the guts of the crib, not the frame. The interior brush should be packed tightly enough to block out most light. Don’t worry about making it so dense that fish won’t be able to get inside. Pockets will form here and there, and fish are astoundingly adept at squeezing into the tiniest spaces. Long branches should extend from the crib on all sides and through all the slats. If possible, include some long branches stuck into the top of the crib to give it some extra dimension. The idea is to create as thick and complex a jungle as possible. The final result will resemble a thick mass of long branches extending from the dense pack inside the crib. The branches should reach from every depth of the crib in every direction and at every possible angle. If your finished crib looks even vaguely tidy, it needs more work.

View from Inside a Fish Crib (c)Eric Engbretson

Designs that Don’t Work from Day One:

Cribs that incorporate Christmas trees work adequately but for a very short time. Christmas trees deteriorate so quickly that in just a year or two, they no longer provide the complex cover that fish desire. In addition, fish will ignore cribs that are too small, too short, or too simple in design.

Examples of poor designs are cribs made of wooden pallets that rest only a couple of feet off the bottom, or cribs with huge spaces between pallets and no interior brush. Star-shaped cribs that resemble the obstacles used on the beaches of Normandy in World War II may look fascinating, but they lack the complexity, shade, and cover to attract fish well. Cribs containing white birch bark or white PVC pipe always fail. After all, fish refuse to be silhouetted against a white background that makes them too visible to predators. This list is scarcely exhaustive: There are many other design flaws in cribs that don’t attract fish.

Location:

Depth

When it comes to location, success depends largely on depth. When cribs are placed shallow enough to let sunlight reach them, they grow algae and other organic material. This serves as a food source for juvenile fish and also makes the cribs fuller and denser. When cribs are placed closer to the littoral zone, they’re much more accessible to the newly hatched fry that will quickly colonize them and provide the food that attracts larger fish.

When I’m scuba diving, I see fish cribs in deep water go largely unused most of the year. The water is colder here and may lack adequate oxygen. In general, these cribs receive visits by fish in fall and winter. On the other hand, fish in shallower water will use a crib virtually year-round. Some of the best fish cribs I’ve seen were ones that weren’t properly weighted. When the ice melted, they floated toward shore and ran aground. When allowed to remain in place, these cribs were quickly covered by algae and were populated immediately by juvenile fish and newly hatched fry. Despite their extremely shallow location, they attracted game fish year after year and even served some fish as a structure for spawning.

The Substrate

Cribs should always be placed on a hard bottom or substrate. If placed on a lake bottom with 12 inches of muck, let’s say, the crib will sink into the muck and you’ll effectively lose a foot of height. Since height is vital to fish, you don’t want to lose it. A muck bottom also eliminates the basement floor.

The Basement Level

Another reason a hard bottom matters is that you want about a foot of clearance between the lake bottom and the base of the crib. If fish can swim underneath your crib in this basement level, you’ve really got something to brag about. Walleyes and bass, by the way, are two species especially drawn to cribs that let them swim underneath.

Plants

If the crib rests in shallow water where plants can grow, it’s often possible to extend the life of the crib almost indefinitely. As multitudes of fish congregate around the crib season after season, their feces can accelerate a lush growth of plants. This patch of vegetation is denser than the surrounding area and creates desirable habitat all by itself. In time, after the interior brush decomposes, it’s possible that tall aquatic plants will replace it, a process that prolongs the lifespan and effectiveness of the crib. If the crib sits in water that’s too deep for plants to grow, none of this growth will take place.

Multiple Cribs in One Location

Cribs located close to each other always outperform single units. Fish will often travel back and forth in a cluster of cribs. Even if they are built alike and placed at the very same depth, they form individual identities, and multiple cribs will be used by different species in various ways. For example, one crib may attract many more rock bass than another that is just a few feet away and populated mainly by sunfish. The differences in the cribs are largely indiscernible to our eyes, but the fish notice subtle distinctions that drive their preferences. The rule, then, is simple: Multiple cribs offer multiple choices and greater numbers of fish.

Regulations

The regulations on the placement of fish cribs are mandated by Natural Resources Departments in many states and other jurisdictions. In my state, Wisconsin, permits for fish crib construction and placement explicitly instruct builders to place them with at least five feet of water over the top of the structure. Since the cribs themselves are typically four or five feet high, the minimum depth for placement is nine or ten feet. The concern here is understandable. Cribs can create hazards for boaters, who may be unaware of their locations. However, if I were placing cribs on my own private lake, free from regulations, I would place them shallow enough so that only two or three feet of water covered the top. This way, I might be able to replenish them with new brush from time to time as the older material disintegrated. This would greatly extend their natural lifespan.

The Future of Artificial Fish Shelters

In recent years, fish-crib makers have gotten very creative and used a variety of materials. Most popular of the new wave of materials are things normally destined for the junk pile or landfill. Today it’s not unusual to see fish cribs made of stacked wooden pallets, plastic, or PVC. They feature clever designs, and I’ve seen some of them underwater in lakes that I frequent. But the truth is that they don’t seem to fare well. While they may be lighter, easier, and cheaper to make, their main drawback is that they lack the size and complexity to prove attractive to fish. The best ones take up the most space and most effectively mimic trees, sunken timber, and other natural elements.

An example of a poorly constructed fish attractant.  Notice the lack of complexity and the large open spaces that provide shade, but nothing in the way of cover. @Eric Engbretson Photo

Fish Cribs as Fish Habitat

Let’s get one thing straight. Fish cribs are definitely not fish habitat. They’re artificial constructions designed to concentrate unusually large numbers of fish in a very small area so fishermen can catch them. Fish cribs do not normally provide the elements fish need for spawning or nesting. At their best, fish cribs merely impersonate fish habitat. In fact, in lakes with an abundance of excellent fish habitat, even the best- made and best-placed cribs will go ignored by fish in favor of superior natural structure. In sum, fish cribs work best in lakes where there is little or no natural structure for fish to use.

Traits of Effective Cribs:

·They reside in relatively shallow water (10 to 15 feet)

·They receive ample sunlight and they support algae and other organic growth

·They are in water that is shallow enough to let submergent plants grow nearby

·They sit on a hard bottom

·They are at least four feet high

·They have a space at the base that lets fish swim under the crib

·They are thickly packed in the center with various sizes of brush and branches

·They have long and complex branches on all faces extending away from the crib

·They have a complex design

·They are placed together with other cribs

·They are in lakes that contain little or no natural structure

Traits of Ineffective Cribs:

·They sit in water that’s too deep (or too shallow if the water’s too warm for fish)

·They sit too deep to receive ample sunlight and support organic growth

·They are in water too deep for plants to grow nearby

·They sit on a mucky bottom

·They are less than four feet high

·They have no space at the base where fish can swim under the crib

·They contain Christmas trees or have little or no brush packed into their center

·They have a design of limited complexity

·They are placed alone

·They are in lakes with abundant natural habitat and structure

Conclusion

As with any set of guidelines and suggestions, there are always exceptions. My observations and conclusions come from years of scuba diving in the northern lakes of the upper Midwest. While complexity of design is universally important, in other parts of the country, many of my suggestions on placement may ignore local conditions and require adaptation. For example, in large southern reservoirs, water temperatures can soar into the 80s and force fish to spawn and live in far deeper water, where lower and more comfortable temperatures prevail. In very clear lakes, sunlight may penetrate 30 feet or more, and plants can grow at greater depths than in other locales. In lakes like these, specific local conditions must be taken into account. Because of such variables, it’s important to have a good understanding of your lake’s ecology and other characteristics. Understanding the specific dynamics of any given lake will help immeasurably when you decide on the best locations for a crib. By Eric Engbretson

PotashCorp Sets New Trend In Tournament Bass Fishing”Helping Nature Provide”

There are countless Bass fishing events that take place across our country each year allowing participants a chance to take home substantial prize money and products. This past weekend was no exception on J. Strom Thurmond Reservoir  in Appleton,Georgia.

 With a first ever of it’s kind, The PotashCorp FishBack Open Team Tournament, contestants competed to raise money and awareness in support of the Georgia Ovarian Cancer Alliance (GOCA) and the North Augusta Fishing Team.  After the two day event, 100% of the proceeds were donated to these two fine deserving groups with $6000.00 and $4000.00 respectively being  awarded.

With a guaranteed payout of $12,000 for first place, more than 125 boats competed in this first annual open. The two man team event goal, was raising money for two great groups. Boats and fisherman from numerous surrounding states, geared up for this unique opportunity to fish this expansive body of water.

Fast boats and seasoned anglers planned to  jockey for a chance at taking home one of the many cash and donated prizes, including two 52″ wide screen T.V’s donated by Fairway Ford.

Before first light on Saturday, hundreds of decked out fishing rigs decended on Wildwood Park and the Tommy Shaw Memorial weigh in at Clark Hill.  Anglers of all levels  including a few FLW pro’s, then discovered fishing wasn’t the only job on hand for the day.

The twist to this groundbreaking Bass tournament concept…….install artificial fish habitat during the event, enhancing the environment and the fishery! Maybe come back on day two and catch a lunker on the habitat unit you installed on Saturday!

That’s right, each boat was required to give something back to the fishery by installing an artificial fish habitat structure at either their first or second stop of day one. Over 150 new artificial habitat units were installed during the event.

More than one strange look was apparent when the requirement was announced. You want  me to put what in my spotless, pristine gel coated water rocket? I barely have enough room for the twenty something rods and hundreds of pounds of tackle we can’t fish without.  Are we going to fit yet more gear and supplies, ropes, cinder blocks, etc.?

No worries, each boat of two fisherman received a Safehouse model habitat by Fishiding.com to unfold and install. These patented, self contained habitat units are made from reclaimed vinyl siding, cemented into a PVC container. Standing about 45″ tall when shipped, the vinyl limbs bend out in all directions and create a “Safehouse” about 7′ diameter and 3′-6″ tall, weighing approximately 15 pounds.

No additional tools or supplies…or mess when putting these habitat units out. Just bend to shape by hand, whatever looks good, then toss over the side. Each artificial fish habitat unit will sink to the bottom and land upright to resemble a bush. The wide limbs create maximum shade, often preferred by bass and forage fish. Nutrients then stick to the vinyl and start the food chain.

The brains behind this first of it’s kind conservation awareness tournament came from the event mastermind, Joey Bruyninckx of PotashCorp.

“Giving something back to the fishery only made sense.” Cancer, Kids and Conservation, what better causes to support?

We met Joey and his team through our involvement with the North Augusta fishing Team. PotashCorp has been a loyal supporter of the North Augusta Fishing Team.( NAFT ) Months back, we were contacted by a hard working young lady named Rosie DeAnnutis, a selfless volunteer for the NAFT. She asked if we may like to get involved in supporting the kids on a cold spring tourney at the same location, Wildwood Park back in March.

We very much wanted to be involved, but because of the timing and the distance, we called on our trusted partners at SOlitude lake Management at their nearby office’s in Charlotte and Raleigh to assist us by speaking to the kids about habitat. SOlitude  has various offices throughout the mid-Atlantic states.  Serving clients in 9 states  including: VA, NC, SC, MD, DE, PA, WV, NJ and NY, offering top notch professional service and advice for all your lake and pond aquatic needs. Aquatic, Fishery, Wildlife and Forestry Biologists, Environmental and Ecology Scientists, all make up the SOlution to a better planet earth.

Matt Phillips, their Aquatic Biologist/Environmental Scientist was happy to help and make the three hour drive to participate. The group discussed fish recruitment, stocking and available habitat. These young, fishing machines embraced the information and wanted to be involved in any habitat restoration plans they could assist with. Matt and Joey began to discuss ideas for the upcoming FishBack Tourney that cold and overcast day as the kids enjoyed the time spent together, outdoors.

The NAFT is open to kids in junior high through high school, ages 11-18. The coach Sean Hall, has a special gift. Gaining the trust and respect of these kids, he loves the outdoors and teaching them about what is important for their future, and the environment. More habitat articles at fishiding.com

Sean brings in DNR officers, Biologists and other related professionals to talk to the kids about boating safety, fish health and species identification to name just a few. “Fishing is only a small part of what these kids take out of being part of the team.”

Although Sean is amazing in how he keeps the kids attention, he certainly can’t do it alone. Jeannie Parks Wilson and Bobbi Boatwright round out the staff to keep this team growing. Getting involved in more events and spreading the message surrounding the multi-faceted benefits of youth fishing teams is their core goal.

After speaking with local DNR officers, it was determined that the lake needed additional habitat, more than any other feasible efforts like stocking, which was another idea and potential option. The lake levels had been extremely low in the recent past which takes a significant toll on fish spawning and recruitment. Additional habitat that fish can utilize to feed, hunt and hide within creates not only big bass, but forage species as well.

This less known concept in habitat improvement is growing Nationwide and moving to installation of inert, artificial materials, that last underwater for decades or longer. In the past, brush piles, Christmas trees and the like have been the norm. Although these materials hold fish and work very well. Their life underwater is short lived due to decomposition, also robbing dissolved oxygen from the water column. Inert materials like boulders, rock and plastics never break down and provide a surface for life to form immediately after submersing.

With over 50% of the Nation’s waters in an impaired state, biologists and esteemed professionals from all the State and Federal agencies are looking for ways to improve water quality before it gets any worse. Aeration, Floating Treatment Wetlands, living shorelines and artificial habitat, are just a few of the tools we are learning have multiple benefits.

These products when placed in the water, attract and convert excessive nutrients like phosphorus and nitrogen into fish food called periphyton. That fuzz that grows on surfaces underwater….”mothers milk” of the underwater world. All fish graze exclusively on this highest known source of food for their first year of life. Unlike aquatic vegetation, these products never die off and continue to process nutrients all year around in a process called biomimicry. This same technology is currently being used in fields like wastewater treatment, fish farming, aquaculture and hatchery settings worldwide.

The Potash Corporation, founded in 1989 is one of the world’s largest producer of Potash, Phosphate and Nitrogen, responsible for 20% of the global capacity through their Canada operations. PotashCorp has built the world’s largest fertilizer enterprise by capacity on world-class potash resources and high-quality phosphate and nitrogen assets. These primary nutrients that crops need, as well as livestock feeds and industrial goods, are an essential part of our everyday lives.

PotashCorp  brought in support from all over for this unique twist on bass fishing. The Clark Hill Committee and Columbia County worked tirelessly for weeks with Joey and his team to make this event the huge success that it was.

Fairway Ford provided registration and support as well as trucks for display on tournament days, as well as prizes for the raffle.

Dixie Riverside A&A Vending services also contributed not only by donating all the food and drinks, but has been an ongoing supporter of the North Augusta Fishing Team.

Fireplaces and More were on hand cooking fresh pulled pork sandwiches, dogs and the like for the two day event, keeping the masses fed.

Zoom baits, another NAFT supporter and integral part of this years FishBack tournament, were on hand with samples of some new baits for all involved and a major part of the planning to make this years event possible. Chris Baxter, Zoom sales manager and FLW pro, has a special connection to this event. After his wife was diagnosed with stage 3 ovarian cancer, he wanted to do more to raise awareness for other women and possibly save a life with early detection. Baxter reached out to Doug Barron with the GOCA.

More on Chris and his partnership with GOCA in a story recently written in Wired2Fish.com.

Doug and his right hand man Chase Powell, were around all weekend to answer questions and provide literature and support regarding ovarian cancer. Passionate outdoors men, these two guys have a soft and dedicated commitment to help women and their families diagnosed with this unfortunate disease.

From black tie events and prestigious supporters, fishing tournaments with shorts and sandals, the message on how to early detect this type of cancer is one of their main goals. Lots of travel and long days are the norm for these two stewards of ovarian cancer support and education.

Kicks 99 radio also was on hand with music and games, proudly showing their support for the kids and the Georgia cancer Alliance.

GreenfishTackle and The Tackle Shop had strong support for their products both on and off the water. Owner Jon Hair not only spent countless hours planning with the team but also got out and caught some fine fish as a contestant in the event.

Seatow was there for all on the water support as well as donating prizes to the raffles.

Loads of bass made their way to the weigh in, almost 8.5 pounds and 7.5 pounds  won the big bass checks for $1000.00 on Saturday and Sunday respectively. The NAFT kids ran to the lake for release of each boats catch like revolving fish doctors, spending needed time to revive tired fish. Two, five fish limits were added together for the total weight of the event, which a number of the top finishers were over 30+ pounds in aggregate!

A unique and welcome surprise for a couple traveling from the Chicagoland area. My wife Renee’ and I were welcomed into this family of fish loving folks, dedicated to helping others less fortunate and bettering others lives. A touching prayer and our National anthem started the event Saturday morning in the dark. Hundreds of eager contestants stood silent with respect, heads bowed and hats off.  Southern hospitality is alive and well in the Augusta area. Take note America, this is how it’s done!

Photos by: Michael E. Johnson Photography 706-832-6762

additional links/stories: ODU, facebook Wired2Fish, potashcorp/facebook

The unexpected consequences of fighting Eurasian Watermilfoil, preventing fish from successfully reproducing?

Lake on the Brink:

The unexpected consequences of fighting Eurasian Watermilfoil

By Eric Engbretson

 

 

In 2012, Greg Matzke, a fisheries biologist for the Wisconsin Department of Natural Resources, made a startling discovery on Florence County’s Lake Ellwood. During a comprehensive fish survey which included spring, summer and fall netting and electrofishing surveys, Matzke discovered that all of the lake’s largemouth bass were older than 5 years of age, with approximately 91% of the largemouth bass population being at least seven years old.  The absence of younger fish indicated a recruitment failure for a number of years.  Such failures in largemouth bass recruitment over multiple years are unprecedented in the state of Wisconsin.

 

“The current largemouth bass population is in serious trouble,” Matzke reported. “It appears that natural reproduction of largemouth bass has not occurred since 2007. As these older/larger fish move through the population, a significant reduction in largemouth bass abundance will take place, with the potential for the complete loss of this species of fish unless the current situation changes.”

 

Matzke next began looking at the lake’s panfish population.  What he found was stunning. Overall, the lake’s panfish abundance had fallen an estimated 75% in just the last 10 years, with bluegill and rock bass abundance down an estimated 65% and 89% respectively, showing that these populations also appear to be collapsing. Intense sampling throughout 2012 found only a single black crappie under six years of age, showing another alarming recruitment failure in several consecutive years. When Matzke analyzed the ages of Lake Ellwood’s northern pike population, the results were even more disappointing: There were no pike under the age of eight!

 

Matzke stared at the data he had collected. His department had never seen a mystery like the absolute and complete recruitment failures of native northern pike, black crappie, and largemouth bass (along with significant reductions in recruitment of other panfish populations). He shared his findings with other fisheries professionals across the state and they all said the same thing.  They had never seen a collapse like this in their careers. Matzke and his team scrambled to collect more data and tried to find a cause that could have brought the fish to the brink of extirpation in Lake Ellwood. Surveys from 2002 had shown normal abundance, size structure, growth, and recruitment in all of these species. What had happened in the last ten years that was preventing fish from successfully reproducing?

 

The only thriving species of game fish in the lake were smallmouth bass. Their abundance and size structure had grown in the last decade and recruitment was high.  This suggested that the problem was targeting specific species of fish. Because Lake Ellwood’s smallmouth bass were doing so well while the other species were collapsing, the focus turned to the lake’s historically sparse but important aquatic plant community. All the species showing recruitment failures are highly dependent on aquatic vegetation for spawning as well as cover and food for their young. Matzke observed that smallmouth bass seem to be different. “The fact that this species was not affected by the reduction in plant life,” he said, “is not a major surprise since as a species smallmouth bass are less dependent on aquatic vegetation.”

 

The Smoking Gun

 

Eurasian Water Milfoil was discovered in Lake Ellwood in 2002. Herbicide treatments began in 2003 and increased every year. By 2007 recruitment of northern pike, largemouth bass and black crappie had come to an end. “When I started to analyze the data it was strikingly obvious to me that there are some problems associated with the herbicide”, said Matzke. When he graphed the fish abundance (by year class) over the last decade and overlaid it with a graph showing yearly herbicide treatments, he found what he believed was a critical connection.  Fish numbers fell as the amount of herbicide increased.  Interestingly, in the year following a relatively low application of herbicide, young bluegill (and black crappie to a much smaller degree) began to appear again, but their numbers are still very low and they will likely disappear before they reach age 2.

 

 

 

Year class strength, indexed using age estimation to determine number of individuals of each year class captured during a 2012 comprehensive survey, for northern pike, black crappie, largemouth bass and bluegill plotted against the number of pounds of 2,4-D (not acid equivalent) used to treat aquatic plants in Lake Ellwood, Florence County, 2003-2012.

 

 

 

“We still wonder which stage of reproduction has failed in these species”, says Matzke. “Aquatic vegetation plays a major role in spawning site selection and in the survival of eggs and fry. Plants are also the source of primary production providing food and habitat for young fish and prey items, including invertebrates and minnows. It seems likely that one or all of these important phases of reproduction are dwindling in Lake Ellwood.”

 

On April 17, 2013 Matzke met with the Lake Ellwood Association to reveal his data and conclusions. He told the group, “The main cause for failed northern pike, largemouth bass and black crappie recruitment (along with the massive reduction in panfish abundance) appears to be the loss of aquatic vegetation.” The 2-4-D herbicide used on Eurasian watermilfoil had been successful in reducing the abundance of this invasive species significantly. Conversely, other native plants were also harmed by years of chemical treatment. Matzke said he has no reason to believe the chemicals have directly caused a failure in reproduction of any species of fish in Lake Ellwood. However, Matzke does believe that the chemicals have indirectly caused recruitment failure by eliminating too many of the aquatic plants young fish need in order to survive.  Matzke has called for a change in the way the Lake Ellwood Association has been managing the lakes aquatic plants.  He recommended that further chemical treatments for milfoil be stopped.

 

“First and foremost,” says Matzke, “we need to promote and strengthen aquatic vegetation in Lake Ellwood.” He stresses the role of aquatic vegetation in spawning and concludes that the loss of vegetation (including the invasive milfoil) has almost certainly wiped out a great deal of forage for young fish.

 

It seems that milfoil treatments controlled the invasive plant but also jeopardized the health of the lakes fishery. Today the lake contains a dwindling and rapidly aging population of largemouth bass, black crappie, northern pike, and bluegill. Matzke hopes the plants will come back in time for the remaining old fish to produce at least one year class before they die. If that doesn’t happen, many fish populations will likely be extirpated from Lake Ellwood. New fish can be stocked, of course, but the lake would lose the unique genetic lineage of the fish that have lived there for thousands of years.

 

 

The Future

 

Could chemical herbicide treatments for Eurasian watermilfoil be reducing fish recruitment in other lakes? None of the other lakes that have been receiving chemical treatments have had their fish populations surveyed this intensely. Large scale recruitment problems due to loss of important plant cover could be taking place throughout the region where the invasive plant is now being fought. There is no way to know if this is happening, and frankly, up until now, there has been no reason to find out.  Fisheries experts around the state are only now learning of Matzke’s findings on Lake Ellwood. In the future, they will likely start paying more attention to fish recruitment on lakes treated for Eurasian watermilfoil which would allow the Department of Natural Resources to determine whether this crisis is an isolated instance or a more widespread problem.

 

In the meantime, it’s a race against time for Lake Ellwood’s native fish. The question remains: Will the plants come back in time to save these fish populations?

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