Abstract :
Cadmium poses a serious environmental threat to the aquatic ecosystems. In the present study, the acute toxicity test for cadmium chloride was conducted for 96 h period using freshwater fish Channa punctatus as experimental model. The LC50 value was determined by using two different methods. According to Trimmed Spearman Karber method it was 368.23 mg/L, but when the same data was analyzed according to the arithmetic method of Karber as adopted by Dede and Kaglo (2001), it came out to be 351mg/L. There was difference of 17.23 mg/L between the two LC50 values. The physicochemical parameters were also taken into consideration. Results suggested that cadmium exerted toxic effects on fish behavioural pattern. Dose- and duration-dependent increase in the mortality of fish was recorded with increased concentrations.
Keyword :
Cadmium chloride, Channa punctatus, Acute toxicity, Behavioural changes