Comparative effects of the sublethal poisoning of zinc, copper and lead on the gonads of the teleost Puntius conchonius ham.

The histopathological impact of the sublethal concentrations of zinc, copper and lead on the gonads of Puntius conchonius was evaluated. Copper (Cu) interfered with spermatogenesis temporarily while zinc (Zn) and lead (Pb) produced dilation in the testicular blood capillaries with necrosis and disintegration of the seminiferous tubules. All three metals induced significant atresia in the ovary. The damaged mainly the younger oocytes, whereas Cu and Pb were more effective on relatively older oocytes. The studies suggest a direct action of heavy metals on the gonads.