Abstract:

this experiment was conducted to investigate the effect of chitosan on acute toxicity Induced by cadmium to Tilapia. 540 Tilapia were divided into two treatment groups, each with three replicates, and each replicate 90 ?shes. The control group was designed according to the static test method of acute toxicity; the test group was added equal amount of chitosan with the same method of the control group. The results showed that 24h LC50 for the control group was 20.51mg/L, 24h LC50 for the test group was 33.96mg/L, the significant difference was found between two groups (P<0.01); 48h LC50 for the control group was 9.00mg/L, 48h LC50 for the test group was 18.56mg/L, the significant difference was also found between two groups (P<0.05). Chitosan might decrease the toxicity of cadmium on tilapia to some extent.