A study of lethal concentration (LC50) of zinc sulphate to Channa striatus (Bloch)
P Pandari Reddy, G Sunitha Devi
Industrial effluent containing heavy metals, on entering aquatic environment causes biochemical disturbances in the fish. The present study deals with acute toxicity of zinc sulphate on Channa striatus was investigated using toxicity determination of 96 hours LC50 values. Fish, Channa striatus was exposed to different concentrations of ZnSO4 studied (100,110,120,130 and 140 mg/l) and LC50 value was found to be 120 mg/l at 96 hours. All the exposed fishes were daily observed and dead fishes were removed immediately. The mortality was recorded on daily basis. The LC50 value at 96 hr was found to be 120 mg/L to Channastriatus. While the obtained results were analysed by the Finney’s probit analysis method. Survival time decreased with increasing concentration of Zinc Sulphate. Zinc Sulphate concentration was found to be more toxic for Channa striatus. Further study needs the processes by which these chemicals affect haemato-biochemical and histological changes of the fish.