Vol. 2, Issue 5 (2017)
Chromium accumulation in gills and muscles of shellfish species from Pulicat lake, Tamil Nadu, India
Author(s): Dhinamala K, Shalini R, Pushpalatha M, Arivoli S, Samuel T, Raveen R
Abstract: Heavy metals are harmful to most organisms at some levels of exposure and absorption. Many marine organisms have the potential to bio-concentrate high levels of metals from their environment and can accumulate the biologically available forms of pollutants that are always present in the environment thus enabling the continuous monitoring of pollutants. 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 chromium in its gills and muscles from January 2011 to December 2012. A seasonal variation in the uptake of chromium was observed. The results indicated that Scylla serrata during premonsoon accumulated the highest amount of chromium in its muscles in 2011 and 2012 and the values were 5.79 and 5.86µg/g respectively. In conclusion, though the level of chromium in the tissues of all the six species of shellfish studied at Pulicat lake was within the accepted levels, it is emphasized that for the better management of the estuary and as an example to similar estuaries around the world, detailed metal speciation studies should always be considered alongside biomonitoring programmes, in order to correctly assess the potential risk of metal pollution in aquatic ecosystems.