fathead-minnows-in-tank

The fathead minnow is a dull, common bait fish, but it has become an important species for research on endocrine disruptors. Here, fish are being raised for research at a U.S. Environmental Protection Agency laboratory in Duluth, Minn. Photo: Kate Golden, Wisconsin Center for Investigative Journalism

The fathead minnow is a dull, common bait fish, but it has become an important species for research on endocrine disruptors. Here, fish are being raised for research at a U.S. Environmental Protection Agency laboratory in Duluth, Minn. Photo: Kate Golden, Wisconsin Center for Investigative Journalism

The fathead minnow is a dull, common bait fish, but it has become an important species for research on endocrine disruptors. Here, fish are being raised for research at a U.S. Environmental Protection Agency laboratory in Duluth, Minn. Kate Golden/Wisconsin Center for Investigative Journalism