Among populations of fish with gonadal intersex, significant levels of vitellogenin (VTG) were reported in male roach, gudgeon, and flounder in the United Kingdom (Allen et al.
After observations of high prevalences of gonadal intersex in male white perch from several sites in the lower Great Lakes, we hypothesized that these gonadal abnormalities were induced in white perch by exposure to estrogenic EDSs.
After the putative identification of gonadal intersex in white perch from Cootes Paradise, male white perch were collected once again from Cootes Paradise as well as two other regions of the lower Great Lakes (Bay of Quinte and Lake St.
In roach (Rutilus rutilus) and gudgeon (Gobio gobio) populations from rivers in the United Kingdom, there was a high prevalence of gonadal intersex, which was attributed to EDCs discharged from the effluents of sewage treatment plants (STPs) (Jobling et al.
This is the first study to show that exposure of fish to isoflavone compounds can induce gonadal intersex.