Studies on heavy metal pollution in selected edible bivalves of North Kerala

Ashalatha, K B (2003) Studies on heavy metal pollution in selected edible bivalves of North Kerala. Masters thesis, Central Institute of Fisheries Education.

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    The primary purpose of the present work was to study the presence and distribution of certain heavy metals in the bivalve molluscs, Crassostrea madrasensis, Saccostrea cucullata and Sunetta scripta of the estuarine and mangrove areas of North Kerala. Estimation of metal contents were also done in the sediment and water samples obtained from areas where the bivalves were collected to know the source and accumulation trend. It has been observed that, bivalves accumulated most of the heavy metals several times more than that found in water. Accumulation of zinc was found highest followed by Copper, Cadmium and Mercury in the months of November - December in all stations; during the entire period of study in the bivalves as well as In sediments. Copper was found more in the water samples. While Cadmium was detected above the permissible level in the bivalves in all the stations during the entire period of study, mercury contents were above the permissible limits in bivalves during certain months (mainly August - September) in all the stations. The pattern of accumulation in different bivalves did not exhibit much difference. The biomagnification of heavy metals was maximum in Saccostrea cucullata followed by Crassostrea madrasensis and Sunetta scripta. ANOVA was done for the monthly variation of metal contents in bivalve of each station and observed significant difference in some months. No correlation could be discernible between metal concentration in bivalves and aquatic abiotic parameters such as salinity, temperature, dissolved oxygen and length of the animal collected from different estuaries and mangrove areas.

    Item Type: Thesis (Masters)
    Uncontrolled Keywords: Heavy metal pollution; Edible Bivalves; North Kerala
    Subjects: Dissertations
    Fish and Fisheries > Biochemical Study
    Molluscan Fisheries > Bivalves
    Marine Environment > Marine Pollution
    Divisions: CMFRI-Kochi > Mariculture Division
    Subject Area > CMFRI > CMFRI-Kochi > Mariculture Division
    CMFRI-Kochi > Mariculture Division
    Subject Area > CMFRI-Kochi > Mariculture Division
    Depositing User: Users 17220 not found.
    Date Deposited: 05 Sep 2016 08:38
    Last Modified: 08 Apr 2022 06:02

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