To investigate the cytotoxicity and its underlying mechanisms of cadmium chloride( CdCl2) to barfin flounder ovary( BFO) cells,in vitro cultured BFO cells w ere treated w ith CdCl2 at different concentrations and investigated toxicologically and cytologically in this study. Cytotoxicity results show ed that the BFO cells w ere very sensitive to CdCl2,and their cell growth were inhibited in a concentration-dependent manner by CdCl2 at a concentration above10 μmol/L. CdCl2at a concentration above 40 μmol/L co...