Toxicity Effects of Cadmium in Grass Carp ( Ctenopharyngodon idella ) and Big Head Carp ( Hypophthalmichthys nobilis )

Abstract

Heavy metals can threaten ecosystem health and of food security. The purpose of percent study was evaluating the sensitivity of grass carp ( Ctenopharyngodon idella ) and Big head carp ( Hypophthalmichthys nobilis ) exposed to cadmium Chloride. To this end, fishes were exposed different concentrations of cadmium in range of cadmium chloride (0, 0.2, 1, 2, 6, 10 and 15 ml/l). The mortality of treatments was calculated at intervals of 24, 48, 72, 96 hours. Analysis of the data showed the 96 h LC 50 of cadmium chloride for grass carp was 4.164 ml/l and for Big head carp was 5.590 ml/l. The results of this study showed that Cadmium is highly toxic for freshwater species.