ST. PAUL, Minn. -- In some Minnesota lakes, invasive species are limiting the growth of a popular fish, according to a new study of the effects on walleye.

University of Minnesota researchers say the culprits are zebra mussels and spiny waterflea. They found in lakes where these are present, they can reduce the growth size of walleye from 12% to 14%. The species take away zooplankton, a food source for the fish.

Jeff Forester, executive director of the group Minnesota Lakes and Rivers Advocates, said the findings should spur stronger action by the state to prevent the spread of these species.

"What we've been doing -- this kind of emphasis on education and personal responsibility -- that's not getting it done," he said. "I think it's slowed the spread, but it certainly hasn't stopped it."

Forester said he'd like to see the state adopt more stringent boat-inspection policies, such as making it a requirement for people getting an operator's license. The Department of Natural Resources said that, in coordination with local governments, it conducted more than 500,000 watercraft inspections last year, a record number.

Walleye is a favorite fish for anglers and many resorts rely on its popularity for business. Forester acknowledged that it's a difficult balance for the state because boats are helping to spread these species, but many lake communities are dependent on water recreation.

"How do we use the lakes in such a way that they're protected for the future," he said, "and we're protecting the resource, which is not the lake itself, but the quality of life and the economics."

One of the lakes in the study, Mille Lacs Lake, has seen many controversies surrounding walleye fishing in recent years. The DNR has enforced strong limits for anglers so the walleye population can rebound. Some of those restrictions have been slowly lifted as walleye makes a comeback in the popular lake.

The study is online at springer.com.

During President Joe Biden's final weeks in office, the Interior Department has announced $41 million in support of water resources and ecosystem health, including two projects in Montana.

The Bipartisan Infrastructure Law will fund work to restore irrigation channels in two Western Montana watersheds.

Chris Edgington, Jefferson watershed project manager for Montana Trout Unlimited, one of the partner groups, called federal funding "critical" to support conservation work, which also benefits agricultural producers.

"We're working with a landowner who voluntarily gives water back to the river for fish," Edgington explained. "It's a great partnership and a 'win-win' project."

More than $1 million will help restore nearly 8,000 feet of side channel and critical trout habitat along the Jefferson River and $1.3 million more will restore nearly 11,000 feet of stream bank and five acres of flood plains on Flint Creek.

Tess Scanlon, project manager for Trout Unlimited, who will oversee the Flint Creek project, said riparian habitat and water quality have degraded due to historical mining, grazing, road-building and other land uses. The effects are extensive, she added.

"Different land use practices have reduced vegetation along the stream banks," Scanlon pointed out. "Which, of course, then impacts habitat quality, has degraded in-stream channel conditions for fish, and has a lot of long term-impacts on stream bank erosion, which affects downstream water quality."

Scanlon noted the solution means rebuilding habitat and stabilizing stream banks with plantings and natural materials, and building fencing and off-stream stock water sources to protect the water and help livestock managers.


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The Environmental Protection Agency would be in charge of protecting and restoring the Ohio River Basin under recently proposed legislation by Reps. Morgan McGarvey, D-Ky., and Erin Houchin, R-Ind.

Other waterways around the country, such as the Chesapeake Bay and the Great Lakes, have dedicated federal restoration funding, but the Ohio River does not, said Michael Washburn, executive director of the Kentucky Waterways Alliance. He added that a large portion of the nation's commerce relies on the 204,000-square-mile river basin.

"What this means," he said, "is that we've had decades, if not longer, of people, communities and industries treating the river more like a machine than like an abundant natural resource that it is."

The Ohio River Restoration Program Act would require monitoring and data collection, habitat restoration, farm conservation, invasive-species control and management, support for homeowners concerned about their local watershed, and investments that help communities prepare for the impacts of extreme storms and flooding.

A 2023 report by American Rivers found the Ohio River is the second most endangered waterway in the nation.

Heavy industry dumped more toxic pollution into the Ohio River watershed than any other in the United States in 2020, according to data from Environment America. Washburn pointed to mounting challenges, such as addressing PFAS contamination, which makes the need for federal funding even more critical.

"Twenty-five million people live in the basin," he said. "Five million of those folks directly get their drinking water from the main stem, but many millions of other folks get their drinking water from tributaries that are also in peril that need help. "

A recent poll from the Environmental Protection Network found nearly 70% of voters say they want the EPA to implement federal protections, such as the Clean Water Act and Clean Air Act.


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More than 143 million Americans are at risk of toxic PFAS, so-called forever chemicals, in their drinking water, according to new test results released by the Environmental Protection Agency and with just 40% of water systems fully tested, the number is expected to rise.

Even low doses of PFAS have been linked to compromised immune systems, fetal harm and cancer.

Ken Sansone, attorney at SL Environmental Law Group, said PFAS, developed by companies including 3M and DuPont, are both very useful but very dangerous.

"It was used in thousands of different kinds of consumer and commercial products, including food packaging, cleaning products, cosmetics, cookware, stain resistant coverings for clothing and furniture and carpets," Sansone outlined. "The list goes on."

The Colorado Department of Public Health and Environment has identified 27 water systems, serving 268,000 customers, exceeding new federal PFAS standards. Colorado lawmakers have moved to phase out PFAS use by 2028, and last year extended restrictions to include cookware, dental floss, menstruation products and others.

Sansone pointed out despite sizable legal settlements with PFAS producers, it will not be enough to cover the costs of shoring up water treatment systems. The American Waterworks Association projects the cost of compliance will be well over $50 billion.

"There's going to be some costs here that ultimately ratepayers at these water utilities are going to remain on the hook for," Sansone emphasized.

The Environmental Working Group estimated nearly 30,000 industrial polluters are still releasing PFAS chemicals. Sansone noted the new drinking water restrictions on PFAS, the equivalent of four drops in 20 Olympic-sized swimming pools, will apply to every public water system in the nation.

"They will need to ensure within the next few years that the water they are serving to their customers does not exceed these limits," Sansone stressed. "They are very low limits. For PFOS and PFOA, they are set at four parts per trillion."


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