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Cadmium Stress On Protein Content In Portunus Sanguinolentus (Marine Crab)

D.Sreeramulu, G.P.Maddaiah, G.R.K.Naidu, G.H.Philip

Marine water studies were carried out to quantify the cadmium distribution and toxic effect on total protein metabolism in marine crab to identify the impacts of potential sources in the vicinity of Visakhapatnam coastal environment. Grab samples were collected at 5 polluted sites and 1 unpolluted site which was chosen as reference during pre monsoon, monsoon and post monsoon seasons in 2003 –2004. The observations revealed that the metal concentrations were low in pre monsoon and high in post monsoon. Were observed cadmium concentrations inversely proportional to total protein content in marine crab, cadmium low PRW1 (0.019 μg/g) bioaccumulation were found in pre-monsoon and high MPS (0.141 μg/g). The amounts of total protein in the dry tissues of marine crabs were found to be high in post-monsoon (168.2 mg/ gm) low in pre-monsoon (154.0 mg/gm). In all sites tested, the reduction percent change of proteins in the dry tissues of marine crabs over the control was found, post-monsoon high reduction percent change in MPS (28.41%) and pre-monsoon low reduction percent change in PRW1 (11.10%). Results indicated that the marine environment near Visakhapatnam coast are potentially influenced by Mehadrigedda and Gosthani rivers that receive domestic, agricultural and industrial effluents and by the city storm water drain. Ship harvester activity is also contributing to the elevated metal concentration in the marine water.