Effect of Temperature on Mortality and Behavioural Responses in Freshwater Catfish, Heteropneustes fossilis (Bloch) Exposed to Dimethoate
نویسندگان
چکیده
Temperature has significant influence on physio-chemical responses of all living organisms including fish. The present study was conducted to evaluate the effect of temperature on dimethoate toxicity (96 h static bioassay) to freshwater catfish Heteropneustes fossilis. Fish mortality data were recorded at 24, 48, 72 and 96 h and analysed using EPA Probit analysis, Version 1.5, software based on Finney's Probit Analysis method to calculate LC values. The 96 h LC values at temperatures, 17.16±0.78°C (January) and 27.50±1.50°C 50 50 (August) were found to be 14.39 mg l and 2.98 mg l respectively. Alterations in behavioural responses, 1 1 especially the schooling, surfacing, mucus secretion, skin colour, eyelid condition and opercular movement were also studied. The increase in fish mortality at higher temperature indicated in the present study may be helpful to determine season specific toxicant concentration for field applications to avoid adverse effect on non target organisms.
منابع مشابه
Acute Toxicity and Behavioural Responses of Heteropneustes Fossilis to an Organophosphate Insecticide, Dimethoate
Static renewal evaluation of the acute toxicity of an organophosphate pesticide, dimethoate against the freshwater fish H. fossilis was conducted in the laboratory. H. fossilis showed behavioural changes against dimethoate intoxication. There were increased opercular movement, sluggish, lethargic and abnormal swimming, loss of buoyancy and muscular tetany. The treated fishes also showed fading ...
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