FOOD SCIENCE

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Isolation and Identification of Spoilage Organisms in Whitefish

XIA Xiudong1, LIU Xiaoli1, WANG Ying1, LI Ying1, DONG Mingsheng2, ZHOU Jianzhong1,*   

  1. 1. Institute of Agricultural Product Processing, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China;
    2. College of Food Science and Technology, Nanjing Agricultural University, Nanjing 210095, China
  • Online:2015-11-15 Published:2015-12-03

Abstract:

The growth of spoilage organisms is the main factor causing the spoilage of aquatic products. Colony counting
showed that the growth rate of spoilage microorganisms in whitefish was much faster at 25 ℃ than at 37 ℃, and therefore
fish spoilage occurred more easily at the lower temperature. Through 16S rDNA sequence analysis, 21 strains isolated from
putrid whitefish were identified as 11 different strains belonging to seven different genera: two strains of Morganella sp.,
three strains of Proteus sp., two strains of Vagococcus sp., one strain of Staphylococcu sp., one strain of Terribacillus sp., one
strain of Lysinibacillus sp., one strain of Vitreoscilla sp.. In this study, the strains of Morganella sp. and Proteus sp. were the
dominant spoilage bacteria and may be the SSO (specific spoilage organisms) in whitefish.

Key words: whitefish, spoilage organisms, isolation, 16S rDNA, identification

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