Heavy metal concentration in sea water, sediment and bivalves off Tuticorin

Concentration of heavy metals Cd, Cu, Fe, Mn, Ni, Pb and Zn in sea water, sediment and bivalve samples from three stations was studied for one year along Tuticorin coast. The concentration was in the order of Fe>Mn>Zn>Cu>Pb>Cd>Ni. Generally the concentration of Fe was very high in the sediment and bivalves when compared to earlier studies from other areas along the Indian coast. High concentration of Fe, Mn, Cu, Pb and Zn was observed during monsoon season. One way ANOVA indicated statistically significant differences (p<0.01) among the samples in the concentration of Cu, Fe, Mn, Pb and Zn. Except for Cd and Cu, no significant difference was noticed in the seasonal variation of other metals

Trace metal contamination of the marine environment in Palk Bay and Gulf of Mannar

The effect of anthropogenic activities has been studied in two stations, each in Palk Bay and Gulf of Mannar, and compared with an offshore site in the former bay for one year on a monthly basis. The mean level of trace metals (Cd, Cu, Pb and Zn) in sediment from polluted areas was 1.23 ppm, 5.42 ppm, 15.52 ppm and 7 ppm respectively. The maximum Cd, Cu, Pb and Zn level in seawater from polluted areas were 1.11 ppb, 26.78 ppb, 21.35 ppb and 247.12 ppb respectively. The mean level of these metals in zooplankton and clam from polluted areas were 1.12 ppm, 14.47 ppm, 24.03 ppm and 267.2 ppm respectively. Analysis of variance (ANOVA) showed no significant difference in the trace metal levels in water, tissue and sediment between polluted and reference station. The paper draws attention to the concentrations of trace metals in the marine environment and biota of Palk Bay and Gulf of Mannar along with other hydrological parameters

Strontium to calcium (Sr/Ca) ratio in otolith as a tool for stock discrimination of oilsardine and mackerel

Otoliths are found in the membranous labyrinth of the inner ear of teleost fish and serve mainly in balancing the organism. They are composed of calcium carbonate and are deposited rhythmically as aragonite crystals within a protein matrix. They have long been used in fish aging studies. Recently, changes in the strontium (Sr): calcium (Ca) ratios in otoliths have received increasing attention, as these provide a method of reconstructing environmental history of the fish. Strontium is a calcium analogue sharing a similar crystal ionic radius and can substitute for Ca in the aragonite lattice of otoliths

Not Available

Not AvailableThe effect of anthropogenic activities has been studied in two stations, each in Palk Bay and Gulf of Mannar, and compared with an offshore site in the former bay for one year on a monthly basis. The mean level of trace metals (Cd, Cu, Pb and Zn) in sediment from polluted areas was 1.23 ppm, 5.42 ppm, 15.52 ppm and 7 ppm respectively. The maximum Cd, Cu, Pb and Zn level in seawater from polluted areas were 1.11 ppb, 26.78 ppb, 21.35 ppb and 247.12 ppb respectively. The mean level of these metals in zooplankton and clam from polluted areas were 1.12 ppm, 14.47 ppm, 24.03 ppm and 267.2 ppm respectively. Analysis of variance (ANOVA) showed no significant difference in the trace metal levels in water, tissue and sediment between polluted and reference station. The paper draws attention to the concentrations of trace metals in the marine environment and biota of Palk Bay and Gulf of Mannar along with other hydrological parameters.Not Availabl

Not Available

Not AvailableConcentration of heavy metals Cd, Cu, Fe, Mn, Ni, Pb and Zn in sea water, sediment and bivalve samples from three stations was studied for one year along Tuticorin coast. The concentration was in the order of Fe>Mn>Zn>Cu>Pb>Cd>Ni. Generally the concentration of Fe was very high in the sediment and bivalves when compared to earlier studies from other areas along the Indian coast. High concentration of Fe, Mn, Cu, Pb and Zn was observed during monsoon season. One way ANOVA indicated statistically significant differences (p<0.01) among the samples in the concentration of Cu, Fe, Mn, Pb and Zn. Except for Cd and Cu, no significant difference was noticed in the seasonal variation of other metals.Not Availabl

Not Available

Not AvailableOtoliths are found in the membranous labyrinth of the inner ear of teleost fish and serve mainly in balancing the organism. They are composed of calcium carbonate and are deposited rhythmically as aragonite crystals within a protein matrix. They have long been used in fish aging studies. Recently, changes in the strontium (Sr): calcium (Ca) ratios in otoliths have received increasing attention, as these provide a method of reconstructing environmental history of the fish. Strontium is a calcium analogue sharing a similar crystal ionic radius and can substitute for Ca in the aragonite lattice of otoliths.Not Availabl