Quantitative assessment of total and Gram-positive aerobic bacteria in fresh and ambient-temperature-stored sub-tropical marine fish |
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Authors: | Ismail M Al Bulushi Susan Poole Hilton C Deeth Gary A Dykes |
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Institution: | (1) School of Land, Crop and Food Sciences, University of Queensland, Brisbane, QLD, 4072, Australia;(2) Queensland Department of Primary Industries and Fisheries, Hamilton, QLD, 4007, Australia;(3) Food Science Australia, P.O. Box 3312, Tingalpa DC, QLD, 4173, Australia |
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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. |
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Keywords: | Ambient temperature Gram-positive bacteria Spoilage Sub-tropical marine fish |
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