Use of the freshwater insect Sphaerodema molestum in the evaluation of aquatic pesticide pollution

Amsath, A.; Senthilmurugan, S.; Dharani, G.; Sivakumar, M.; Subramaniam, M.

Journal of Ecotoxicology and Environmental Monitoring 3(1): 41-45


ISSN/ISBN: 0971-0965
Accession: 002727990

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Toxicity studies of the effects of dichlorvos (Nuvan) on the testis of S. molestum first established that the LC50 was 0.2 ppm. At the 96 h sublethal concentration of 0.05 ppm, the insect showed abnormal behaviour by swimming erratically. A significant decline in the levels of carbohydrates, proteins and lipids (45.9, 43.5 and 51.1%, respectively) was detected in the testis on the 4th day following exposure to sublethal dichlorvos concentrations. These results suggest that S. molestum could be used as an indicator to assess the extent of pollution in the aquatic environment.