| The purpose of this study was to determine the effects of lethal and sublethal concentrations of pesticide Fenos Quick on oxygen consumption in a freshwater fish Channa gachua For finding out respiratory response, the fishes of average length of 15.4 cm and weight of 54.0 ± 2 gm. were exposed to lethal and sublethal concentrations of Fenos Quick for the period 24 hrs. 48 hrs.72 hrs. and 96 hrs. and for sublethal concentration for 7 days, 14 days, 21 days and 28 days. It was observed that the rate of oxygen consumption initially increased and then decreased on pesticide exposure and the decrease was more prominent at 96 hrs. in both lethal and sublethal concentrations. There was a significant increase in oxygen consumption after 24 hrs. and 48 hrs. of exposure to lethal concentration and at sublethal concentration of the Fenos Quick also showed a slight increase by 24 hrs. and 48 hrs but afterwards, the rate of oxygen consumption was slightly decrease below the control level. However, the increase in respiratory rate is higher in lethal concentration as compared to sublethal concentration at 24 hrs. and 48 hrs. At 72 and 96 hrs. the rate of oxygen consumption was decreased and it was higher in lethal concentration than in sublethal concentration of Fenos Quick. Exposure to sublethal concentration continued till 28 days and oxygen consumption was measured on 1st, 7th, 14th, 21st and 28th day. It was observed that the rate of Oxygen consumption initially increases then shows a decline. The increase in oxygen consumption recorded on 7th day was not very significant but it was significant on 14th day. By 21st day, oxygen consumption was found to have declined significantly and it continued to decrease to 28th day.
Keywords: Fenos Quick, Channa gachua, Sublethal, oxygen consumption, toxicity, Pesticide, Girna Dam Malegaon.
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