Ecology, Environment and Conservation Paper

ACUTE TOXICITY AND EFFECT OF FLUBENDIAMIDE (39.35% SC) ON THE OXYGEN CONSUMPTION OF THE FISH, CATLA CATLA (HAMILTON)

S.K. Parveen, K. Veeraiah, G. Vani1 and M. Vijaya Kumar

Abstract

The fish Catla catla fingerlings were exposed to the test toxicant an insecticide Flubendiamide for 24, 48, 72 and 96 hrs and the LC50 values were calculated and were reported to be 3.566, 3.456, 3.0221 and 2.892 mg5˜¹ respectively for 24, 48, 72 and 96 hrs. After determination of LC50 values the fish were exposed to sub-lethal concentration (1/10th of 96 hrs LC50 value i.e., 0.289 mg5’¹) for 24, 48, 72, 96 hrs and 8 days and the changes in oxygen uptake of the Indian major carp Catla catla was studied. Fingerlings were exposed to sub-lethal (0.289 mg5-¹) and lethal (2.892 mg5’¹) concentrations of flubendiamide for 24 hrs, 48 hrs, 96 hrs and only to the sub-lethal concentration exposed for 8 days. In both sub-lethal and lethal concentrations for all exposed periods Catla catla showed an increase in oxygen consumption during the initial time of exposure and a gradual decrease during the subsequent periods of exposures. This initial increase was from 0-6 hours in 24, 48 and 96 hrs where as in 8 days exposed fish the initial increase is only up to 0-4 hours. Alterations in oxygen consumption may be due to respiratory distress as a consequence of impaired oxidative metabolism. In the present study it was observed that flubendiamide has altered respiratory metabolism in the test fish Catla catla which can be used as a bio-indicator for assessing pesticide induced alterations in the uptake of oxygen in the fish. Fish in the sub-lethal concentration were found under stress, but that was not fatal. The results obtained in all were discussed with the available literature.