The Indian edible oysters, Crassostrea madrasensis of average size 6.4 ± 1.2
cm x 4.3 ± 0.8 cm were exposed to two sub-lethal doses (0.1 and 0.2 ppm) of an organophosphorous pesticide namely, Nuvan. The results revealed that even though
mortality was not affected even at a very high concentration of 10 ppm, there were significant histological changes in all the
tissues studied, namely, adductor muscle, mantle and gills both at 0.1 and 0.2 ppm. The study revealed that exposure to Nuvan affects the general health of the
oysters and also breaks the natural barriers and exposes the animal tissues for the entry of pathogens, which in turn can result in large-scale mortality.
More abstracts about the Nuvan induced histopathology in the Indian edible oyster, Crassostrea madrasensis (Preston)