Nirmala Kallagadda and Dr. V Venkatarathnamma

Background: In aquatic media, over stimulation or depression of respiratory activity is one the most important manifestations of toxicity of chemical pollutants. Steady and progressive decline in ventilator pattern and decline in oxygen consumption. Majority of the pesticides have tendency to accumulate in tissues of aquatic animals and excess pesticides in the environment cause damage to the behaviour and physiology of living organisms especially the respiratory physiology. The assessment of these effects of insecticides to non-target aquatic organisms is very difficult.
Aim & Objective: To study the effect of an organophosphate Phosalone (35% EC) on respiratory metabolism of Ctenopharyngodon idella
Results: In present investigation phosalone pesticide was used to study its effect on respiratory metabolism of Ctenopharyngodon idella. The result showed significant decrease in oxygen consumption rate. In sub-lethal concentrations of Phosalone (35% EC) commercial grade; it was observed that fish Ctenopharyngodon idella showed tendency of increase in oxygen consumption during the initial time of exposures i.e. 1 to 6 hours and a gradual decrease was observed during the subsequent period of study. The presence of sub-lethal concentration of toxicants is inevitable. In such a case, the fish Ctenopharyngodon idella was more sensitive to toxicant. The toxicant stress in oxygen consumption along with depletion in oxygen in aquacultures practices make them less fit and reduction in growth due to lack of proper metabolism. The fish was in more stress during first hour and later they are showing signs of recovery. That recovery is evident as the toxicant exposure is increased in time, during 24 hrs experiment.
Conclusion: The present study stressful behaviour of respiratory impairment due to the toxic effect of Phosalone on the Ctenopharyngodon idella gills. It is presumed that the toxicant directly or indirectly affects the respiration of fish. The rate of oxygen consumed by the affected fish was very low. Once the respiration of the fish is affected, in turns all the biological activities of the fish will also be reduced.

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