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Bioaccumulation of cadmium in gills and muscles of shellifsh from Pulicat lake, Tamil Nadu, India

Journal of Coastal Life Medicine 2017年第2期5卷 47-50页

作者： Kalyanasundaram Dhinamala Munuswamy Pushpalatha Mohamed Meeran Subramanian Arivoli Samuel Tennyson rajasingh raveen Department of Zoology Madras Christian CollegeChennai 600 059Tamil NaduIndia Department of Zoology Hajee Karutha Rowther Howdia CollegeUthamapalayam 625 533Tamil NaduIndia Department of Zoology Thiruvalluvar UniversityVellore 632 115Tamil NaduIndia

Objective:To evaluate the presence of heavy metal cadmium in six species of shellfish at Pulicat Lake, Tamil Nadu, India. Methods: Six species of shellfish,Fenneropenaeus indicus,Fenneropenaeus monodon, Fenneropenaeus semisulcatus,Scylla serrata,Clibanarius longitarsus and Meretrix casta (M. casta) in Pulicat lake, Tamil Nadu, India were analysed for the presence of cadmium in the gills and muscles from January 2011 to December 2012. Results:The results showed seasonal variations in the uptake of cadmium. Very high accumulation of cadmium was found in the gills and muscles ofM. casta during post monsoon, summer, premonsoon and monsoon. The corresponding values of cadmium present in the gills of M. casta were 1.59, 1.56, 1.48 and 1.46μg/g in 2011 and 1.16, 1.25, 1.15 and 1.14μg/g in 2012. Whereas for muscles, they were 1.14, 0.11, 0.96 and 0.80μg/g in 2011 and 0.49, 0.34, 1.05 and 1.20μg/g in 2012. Conclusion:The results of the present study has shown that the accumulation of cadmium found in the gills and muscles were high in M. casta when compared to other species of shellfish. Thus, the consumption of the shellfish is safe, but does not exclude bioaccumulation risk in their meat. This present study has highlighted the need for estuarine biomonitoring to avoid possible contamination of shellfish and its consumers. The overall scenario of the shellfish accumulating high levels of cadmium indicates that the Pulicat lake is polluted with undesirable elements and the risk of consuming the meat of shellfish by man and other carnivores may lead to their toxicity. Stringent control measures are necessary to control the pollution of this precious lake to reduce the bioaccumulation of toxic metals in organisms.

关键词： Heavy metals Pollution Estuary Pulicat lake

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