Seasonal testosterone UDP-glucuronosyltransferase activity and biliary steroids in Eurasian perch: response to leachate exposure.

In previous studies there was evidence of endocrine disruption in fish in waterways contaminated with leachate from a Swedish landfill. Symptoms included fewer sexually mature (SM) female perch (Perca fluviatilis), distinct sores, reduced gonadosomatic index, and decreased plasma androgen levels. Based on previous findings it was hypothesized that the decrease in plasma androgen concentrations could have been caused by increased steroid excretion.