Abstract
Biochemical changes followed in the freshwater snail Pila globosa (Swainson) during exposure to sublethal concentrations of the herbicide butachlor (26.6 ppm) in the ambient medium, at 3,6,12,24 and 48 h intervals, were marked by a significant decrease in total and soluble proteins, and an increase in free amino acids in foot and hepatopancreas up to 12 h before gradually recovering. Aminotransferase activities and glutamine content decreased during the early periods of exposure, while glutamate dehydrogenase activity increased. After an initial elevation, glutamate synthetase activity decreased at later intervals. Maximum effect of butachlor on the enzymes was seen after 12 h exposure. The extent of increase or decrease in different parameters examined varied between the two tissues studied. These changes are discussed in relation to the toxic stress of butachlor.
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