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Water Management Associations
Endocrine Disruptors in Lakes are Becoming an Emerging Concern
Every spring, Dr. Carl Isaacson, a professor of environmental studies at Bemidji State University, sends his students out to collect perch from waters across Minnesota.

Then, they study an egg yolk protein found in the perchs’ livers, called vitellogenin, which may provide evidence of endocrine disruption in the state’s aquatic species.

Over the past few years, studies of Minnesota’s waters have found a variety of unregulated chemicals -- such as pharmaceuticals, fragrances, fire retardants, detergents and insecticides -- which are widespread in the state’s lakes and rivers.

When male fish are exposed to EACs, they can start to develop female attributes, such as increased vitellogenin concentrations; in more extreme instances, male fish have also been found to produce eggs in their testes.

And while these chemicals have been linked to health problems such as infertility and different types of cancer, “it’s too soon to say whether feminized fish are indicative of health effects for humans too,” an article by National Geographic said.

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Algae Treatment Leads to Massive Fish Kill in Lake Isabella - Lake Isabella has experienced a significant “fish kill” due to low oxygen levels following treatment of an extremely high blue-green algae presence. When the heavy bloom was noted a recommendation was made to close the lake to swimming and boaters and a company was hired to treat the lake with a chemical called SeClear. The following day, hundreds of dead fish were observed lying dead on the bottom and floating on the surface.

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