See:
Changes in the Metabolic Elimination Profile of Testosterone Following Exposure of the Crustacean Daphnia magna to TributyltinGerald A. LeBlanc and James B. McLachlanEcotoxicology and Environmental Safety 45, 296-303 (2000)
A sex hormone that stimulates or controls the development and maintenance of masculine characteristics in vertebrates by binding to androgen receptors.