Effects of Agro Chemicals on Live Fishes

Abstract

The effect of three organophosphorous insecticides, namely, diazinon 60 E.C., nogos 100 E.C. and dimecron 100 SCW on H. fossilis and three species of live A. testudineus, C. batrachus, were studied. The insecticides were in the form of emulsifiable concentrates. In bioassays the or toxicity tests, fishes were exposed to a series of concentrations of chemicals at the laboratory temperature. The dosages were 1.0, 2.25, 3.2, 5.6 and 10.0 ppm. Histopathological effects of these three insecticides on the same species were observed. The dosages were 2.25, 3.50, 5.0. 10.0 and 20.0 ppm respectively. The histopathology of the organs of normal fishes were done to compare them with those of the experimental ones. These insecticides induced certain cellular changes in different organs such as liver intestine, ovary etc. on these fishes. From the bioassay tests and histopathological studies, it was observed that diazinon was most toxic, nogos was moderately toxic and dimecron was least toxic to these fishes among the three insecticides.