MONOCROTOPHOS INDUCED BEHAVIORAL STRESS, BIOCHEMICAL AND HISTOLOGICAL ALTERATIONS IN LAMELLIDENS MARGINALIS (LAMARCK)

Abstract

The present study aimed to investigate the possible effects of acute exposure of monocrotophos on behavioural response, inhibition of protein and glycogen activity, and histopathological changes in mantle and muscle tissues of freshwater bivalve, Lamellidens marginalis. Animals were exposed to sub lethal LC₅ concentration (47.45 ppm) of monocrotophos. The glycogen and protein content decreased significantly (p<0.05) in mantle (28.27%, 35.96%) gill, (16.59%, 53.05%) foot (28.05%, 71.41%) and adductor muscle (27.37%, 64.21%) respectively after 96 hours exposure to monocrotophos. Decrease in glycogen content shows greater utilization of glycogen for metabolic purposes and to combat with monocrotophos stress. Fragmentation of muscle fibre and hypertrophy in mucous cells of mantle was observed after acute exposure to monocrotophos. Protein and glycogen content recovered significantly (p<0.05) in mantle and muscle after 14 days, while all the tissues recovered significantly (p<0.05) after 28 days. These results revealed that there was a significant recovery in biochemical parameters in bivalve after a recovery period of 28 days.