Vol. 2, Issue 5 (2017)
Zinc accumulation in gills and muscles of shellfish species from Pulicat lake, Tamil Nadu, India
Author(s): Dhinamala K, Shalini R, Deepa P, Pushpalatha M, Arivoli S, Samuel T, Raveen R
Abstract: Estuaries play a crucial role in the socio-economic development of mankind in many aspects. Estuaries provide a nursery for the larval forms of some marine fish species, and provide shelter and food for many young and adult fish and shellfish. Introduction of untreated municipal waste water and industrial effluents into these water bodies leads to serious water pollution and majority of them with heavy metal pollution, which gets biomagnified and even reaches man through the food chain. In the present study, six species of shellfish, Fenneropenaeus indicus, Fenneropenaeus monodon, Fenneropenaeus semisulcatus, Scylla serrata, Meretrix casta and Clibanarius longitarsus in Pulicat lake, Tamil Nadu, India were analysed for the presence of zinc in its gills and muscles from January 2011 to December 2012. The results showed seasonal variations in the uptake of zinc. The maximum accumulation of zinc was observed during premonsoon in the gills of Fenneropenaeus indicus (8.56µg/g) in 2011 followed by Clibanarius longitarsus (8.44µg/g) in 2012. In muscles it was 8.23µg/g during monsoon and 7.85µg/g during premonsoon respectively in 2011. The overall conclusions indicated that the Pulicat lake is highly vulnerable to the threats of heavy metal pollution and the consumption of contaminated meat may lead to toxicity. Stringent and adequate control measures are required to save this important lake from heavy metal and other types of pollution.