title: Behavior ofSalmonellaandListeria monocytogenesin Raw Yellowfin Tuna during Cold Storage.
abstract: Behavior ofSalmonellaandListeria monocytogenesin raw yellowfin tuna during refrigeration and frozen storage were studied. Growth ofSalmonellawas inhibited in tuna during refrigerated storage, whileL. monocytogeneswas able to multiply significantly during refrigerated storage. Populations ofSalmonellain tuna were reduced by 1 to 2 log after 12 days of storage at 5-7 °C, regardless levels of contamination. However, populations ofL. monocytogenesScott A, M0507, and SFL0404 in inoculated tuna (10⁴-10⁵ CFU/g) increased by 3.31, 3.56, and 3.98 log CFU/g, respectively, after 12 days of storage at 5-7 °C. Similar increases ofL. monocytogenescells were observed in tuna meat with a lower inoculation level (10²-10³ CFU/g). Populations ofSalmonellaandL. monocytogenesdeclined gradually in tuna samples over 84 days (12 weeks) of frozen storage at -18 °C withSalmonellaNewport 6962 being decreased to undetectable level (<10 CFU/g) from an initial level of 10³ log CFU/g after 42 days of frozen storage. These results demonstrate that tuna meat intended for raw consumption must be handled properly from farm to table to reduce the risks of foodborne illness caused bySalmonellaandL. monocytogenes.
authors.affiliation: Sea Grant College Extension Program, University of Maryland, Princess Anne, MD 21853, USA. cathyliu@umd.edu.
authors.forename: Chengchu
authors.initials: C
authors.lastname: Liu
authors.affiliation: Seafood Research and Education Center, Oregon State University, Astoria, OR 97103, USA. moujing.christy@gmail.com.
authors.forename: Jing
authors.initials: J
authors.lastname: Mou
authors.affiliation: Seafood Research and Education Center, Oregon State University, Astoria, OR 97103, USA. yi-cheng.su@oregonstate.edu.
authors.forename: Yi-Cheng
authors.initials: YC
authors.lastname: Su
keywords: Listeria monocytogenes; Salmonella; foodborne pathogens; refrigeration and frozen storage; survival; yellowfin tuna