MPR NEWS — Chemical compounds from human activity are affecting fish in rivers that feed into the Great Lakes, a new study shows.
Some sites studied had levels of chemicals above those expected to cause adverse effects on fish, such as increased liver size and reproductive problems. Researchers studied sunfish from six Great Lakes tributaries and found many showed signs of stress.
More study is needed on the effects of the chemicals on fish reproduction, said Heiko Schoenfuss, a biology professor at St. Cloud State University who was one of the researchers. St. Cloud State students did the biological analysis.
Read more: https://www.mprnews.org/story/2017/10/02/study-chemicals-affecting-fish-in-great-lakes-rivers
