A study on Behavioral responses to sub lethal  and lethal concentrations of cadmium chloride  (cdcl2.H2O) in freshwater crab paratelphusa  hydrodromous (Decapoda: Brachyura

A. M. Padmanaban; K. Mohan

Volume : II, Issue : VIII, August - 2013

A study on Behavioral responses to sub lethal and lethal concentrations of cadmium chloride (cdcl2.H2O) in freshwater crab paratelphusa hydrodromous (Decapoda: Brachyura

A. M. Padmanaban, K. Mohan

Abstract :

Cadmium (Cd), one of the twenty three heavy metal toxicants, is widely used in Ni-Cd batteries manufacture, metal and mining industry, dentistry etc. These excess amounts in addition to naturally occurring levels gradually build up to toxic levels causing damage to the biota of the aquatic ecosystem. The test species for this study was Paratelphusa hydrodromous which was chosen for its abundance and commercial and ecological importance. 96 hrs LC50 values for premoult and postmoult male crabs were found to be 158.49 ppm and 156.68 ppm. For premoult and postmoult female crabs, these values were 138.68 ppm and 132.43ppm. Each batch of 3 crabs was exposed to a sub lethal concentration (20 ppm) and lethal concentrations (200 to 800 ppm). The present study evaluates toxicity of Cd and its impact on behavioral responses in the fresh water field carp paratelphusa hydrodromous.