Fredrick wrote: >Does anyone have the article?< I could mail you a copy but it will probably be easier if you go a university library and look under Uwe Romer and W. Beisenherz, Environmental determination of sex in Apistogramma (Cichlidae) and two other freshwater fishes (Teleostei), Journal of Fish Biology (1996) 48, 714-725. Julio Melgar