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Microbial communities on Australian modified atmosphere packaged Atlantic salmon
1Australian Seafood Cooperative Research Centre, Tasmanian Institute of Agricultural Research, University of Tasmania, Private Bag 54, Hobart, Tasmania 7001, Australia. shane.powell@utas.edu.au
Food Microbiology
|January 24, 2012
Summary
This study explored microbial communities on Atlantic salmon using culture and DNA methods. Lactic acid bacteria (LAB) may play a significant role in spoilage under modified atmosphere conditions.
Area of Science:
- Food Microbiology
- Seafood Science
- Microbial Ecology
Background:
- Specific spoilage organisms (SSO) in Atlantic salmon are known, but interactions with other microbes influencing spoilage are less understood.
- Modified atmosphere packaging (MAP) is used for fresh fish preservation, but microbial community dynamics require further investigation.
Purpose of the Study:
- To investigate the microbial communities on Atlantic salmon fillets stored under modified atmosphere conditions (carbon dioxide and nitrogen).
- To identify the influence of both dominant and minor microbial members on seafood spoilage.
- To compare the effectiveness of culture-based and DNA-based methods in characterizing these communities.
Main Methods:
- Utilized a combination of culture-based and DNA-based (culture-independent) techniques.
- Analyzed microbial communities on Atlantic salmon fillets after 15 days of storage in modified atmosphere packaging.
- Identified dominant genera (Shewanella spp., Carnobacterium spp.) and minor genera (e.g., Iodobacter, Serratia, Morganella, Yersinia).
Main Results:
- Microbial communities were dominated by Shewanella spp. or Carnobacterium spp. after 15 days.
- Significant variability in microbial community composition was observed, attributed to minor microbial members.
- The integrated approach provided a more comprehensive understanding of microbial community development than single methods.
Conclusions:
- Combined culture-based and DNA-based methods offer greater insight into microbial community dynamics in seafood.
- Lactic acid bacteria (LAB) may have a crucial, previously underestimated role in the spoilage of fresh Atlantic salmon under MAP.
- Understanding these complex microbial interactions is key to improving seafood shelf-life and safety.
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