Total atresia of the ovaries of Tilapia leucosticta (Cichlidae) after intoxication with the insecticide Lebaycid.

Intoxication with sublethal Lebaycid concentrations led to total atresia of the ovaries in 90% of the treated specimens of Tilapia leucosticta. The gonads were filled with atretic follicles and mature eggs were never found. In regeneration trials, intoxicated fish proved to be unable to spawn for at least 9 weeks.