The effect of methallibure (I.C.I., 33828) on the ovary of the carp, Cyprinus carpio

A study has been made on the effect of methallibure (I.C.I., 33828) on ;the ovary of Carp. C. carpio. Methallibure treatment may exert marked inhibitory influence on vitellogenesis in the fish and cause atresia of vitellogenic follicles, the oogonial proliferation is stepped up. The site and mode of action of methallibure is discussed.