Studies on development of optimum depuration protocols for commercially important edible bivalves of India

Chinnadurai, S (2020) Studies on development of optimum depuration protocols for commercially important edible bivalves of India. Doctoral thesis, Mangalore University, Mangalagangothri.

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    Abstract

    In India, since 1990s considerable changes have been taken place in diversification and production of bivalves, most significant of which is the emergence of the green mussel (Perna viridis) and backwater oyster(Crassostrea madrasensis) farming as a commercial aquaculture program. As the bivalves are filter feeding shellfish, which filter water for nutrients, they often accumulate metal contaminants and bacteria including pathogenic bacteria from the growing water. One of the main concerns for bivalve industry is the health risk associated with its consumption. In order to protect the public health we need to ensure the absence of potentially harmful microorganisms and biological toxic metals. Depuration is one of the most efficient methods for reducing the contaminants and increasing the safety of bivalves’ consumption. The most common factors which influence the degree of depuration are: depuration system, water flow rates, water treatment, temperature, salinity and duration of process. In this context, the main objectives of this thesis were to investigate and create a baseline on microbiological and heavy metals contaminations in commercially important edible bivalves of India, to compare the depuration methods on the elimination of bacterial and heavy metal loads, to optimize the depuration process parameters viz., temperature, salinity, age and body-size with respect to bacterial and heavy metal depuration, and to assess effect of heat-cool pasteurization(HCP) on bacterial quality of mussels and oysters. Both the static (fill and draw) and flow-through depuration system (FDDS and FTDS) reduces heavy metals load and the bacterial contamination significantly (p<0.01). But, between the depuration system(FDDS and FTDS), there was no significant difference. Depuration between the species was significantly different (p<0.01) with reference to all microbiological quality parameters. Effect of temperature, salinity, age and body-size on depuration of naturally contaminated three commercially important edible bivalve molluscs was evaluated using static depuration system. Overall, room temperature (30 ± 1ºC), medium size of bivalves and salinity of 25-35 psu are optimum process parameters for depuration of clams, mussels and oysters. The effects of pasteurization on bacterial loads of mussels and oysters showed significant (p<0.01)reduction of bacterial loads and relatively increase meat yield by 40-50 %.

    Item Type: Thesis (Doctoral)
    Uncontrolled Keywords: Bivalve; India
    Subjects: Molluscan Fisheries > Bivalves
    Molluscan Fisheries
    Theses
    Divisions: CMFRI-Kochi > Marine Capture > Molluscan Fisheries
    Subject Area > CMFRI > CMFRI-Kochi > Marine Capture > Molluscan Fisheries
    CMFRI-Kochi > Marine Capture > Molluscan Fisheries
    Subject Area > CMFRI-Kochi > Marine Capture > Molluscan Fisheries
    Depositing User: Arun Surendran
    Date Deposited: 05 Mar 2022 08:23
    Last Modified: 05 Mar 2022 08:23
    URI: http://eprints.cmfri.org.in/id/eprint/15833

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