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    Quantitative assessment of total and Gram-positive aerobic bacteria in fresh and ambient-temperature-stored sub-tropical marine fish

    Access Status
    Fulltext not available
    Authors
    Al Bulushi, I.
    Poole, S.
    Deeth, H.
    Dykes, Gary
    Date
    2008
    Type
    Journal Article
    
    Metadata
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    Citation
    Al Bulushi, I. and Poole, S. and Deeth, H. and Dykes, G. 2008. Quantitative assessment of total and Gram-positive aerobic bacteria in fresh and ambient-temperature-stored sub-tropical marine fish. World Journal of Microbiology and Biotechnology. 24 (9): pp. 1867-1875.
    Source Title
    World Journal of Microbiology and Biotechnology
    DOI
    10.1007/s11274-008-9687-5
    ISSN
    0959-3993
    School
    School of Public Health
    URI
    http://hdl.handle.net/20.500.11937/46102
    Collection
    • Curtin Research Publications
    Abstract

    The current study was undertaken to enumerate Gram-positive bacteria in fresh sub-tropical marine fish and determine the effect of ambient storage (25°C) on the Gram-positive bacterial count. Total and Gram-positive bacteria were enumerated in the muscles, gills and gut of fresh and stored Pseudocaranx dentex, Pagrus auratus and Mugil cephalus on tryptone soya agar (TSA) and TSA with 0.25% phenylethyl alcohol (PEA), respectively. Initial studies indicated that PEA significantly reduced total aerobic bacterial count (TABC) whereas control Gram-positive bacteria were not affected by 0.25% PEA. TABC significantly increased in all fish body parts, whereas Gram-positive aerobic bacterial count (GABC) significantly increased only in the muscles and gills during ambient storage for 15 h. The TABC of the fish species increased from 4.00, 6.13 and 4.58 log cfu g-1, respectively in the muscles, gills, and gut to 6.31, 7.31 and 7.23 log cfu g-1 by the end of storage. GABC increased from 2.00, 3.52 and 2.20 log cfu g-1 to 4.70, 5.85 and 3.36 log cfu g-1. Within each species, TABC were significantly higher in the gills compared to that of muscles and gut; however, no significant differences were found in GABC between muscles and gills. This study demonstrated the potential importance of Gram-positive bacteria in sub-tropical marine fish and their spoilage. © 2008 Springer Science+Business Media B.V.

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