HISTOPATHOLOGICAL CHANGES IN THE OVARIES AND MUSCLE TISSUES OF FRESHWATER FAIRY SHRIMP STREPTOCEPHALUS DICHOTOMUS (BAIRD, 1860), EXPOSED TO MALATHION AND GLYPHOSATE

Author(s): Arun Kumar MS and A Jawahar Ali

Abstract

Possible impact of organophosphorus pesticides namely malathion and glyphosate on the ovaries and muscle tissues of the freshwater fairy shrimp Streptocephalus dichotomus were reported here for the first time. Preadult fairy shrimps were exposed to sub lethal concentration (1/5th of 96hrs LC50) of malathion (2.0 ppm) and glyphosate (0.0011 ppm) for a period of 30 days. Histological observations revealed a few marked pathological lesions such as mild destruction of epithelial layer, follicle cells, nurse cells, necrosis and degeneration of oocytes in the ovaries. Similarly degeneration of muscles, necrosis of muscle fibers, haemorrhages and appearance of pigmented cells in the muscle tissues were evident compared to control. The structural alterations observed in the ovaries and muscle tissues of the freshwater fairy shrimp are suggestive that malathion and glyphosate caused tissue damage at the tested concentrations. Therefore, the findings of this investigation can be taken as biomarkers for monitoring pesticides contamination in aquatic biota.

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