Abstract
The freshwater prawn Macrobrachium dayanum is a small prawn widely distributed all over India and has commercial importance. The freshwater prawn Macrobrachium dayanum was subjected to acute (96 hr) static bioassay toxicity test with the insecticide Dichlorovos and the LC50 value was 0.075 ppm. Prawns were exposed for 30 days under static condition to three sub-lethal concentrations viz. 0.01 ppm, 0.005 ppm and 0.0025 ppm of dichlorovos. Reduction in growth was found in direct relation to increase in the concentrations of the toxicants.
