Microbiological quality of raw fish at retail market in Latvia
2015
Eizenberga, I., Latvia Univ. of Agriculture, Jelgava (Latvia). Faculty of Veterinary Medicine;Institute of Food Safety, Animal Health and Environment BIOR, Riga (Latvia) | Terentjeva, M., Latvia Univ. of Agriculture, Jelgava (Latvia) | Valcina, O., Institute of Food Safety, Animal Health and Environment BIOR, Riga (Latvia) | Novoslavskij, A., Lithuanian Univ. of Health Sciences, Kaunas (Lithuania).Veterinary Academy | Strazdina, V., Institute of Food Safety, Animal Health and Environment BIOR, Riga (Latvia) | Osmjana, J., Institute of Food Safety, Animal Health and Environment BIOR, Riga (Latvia) | Berzins, A., Latvia Univ. of Agriculture, Jelgava (Latvia). Faculty of Veterinary Medicine;Institute of Food Safety, Animal Health and Environment BIOR, Riga (Latvia)
The aim of the study was to evaluate the microbiological quality of raw fish obtained from retail market. Overall, 20 raw fish samples, including roach (Rutilus rutilus), crucian carp (Carassius carassius), European perch (Perca fluviatilis), silver bream (Blicca bjoerkna) and round gobby (Neogobius melanostomus) were collected during October, 2014. Samples were analyzed for total bacterial count, Enterobacteriaceae count, Escherichia coli, Listeria monocytogenes and Salmonella. Total bacterial count in raw fish ranged from 5.58 to 7.84 log10 CFU cmE-2. Total bacterial count in silver bream (7.57 log10 CFU cmE-2) were significantly higher (p is less than 0.05) than in round gobby (6.31 log10 CFU cmE-2). Enterobacteriaceae counts ranged from 1.91 to 5.28 log10 CFU cmE-2, and there were no significant differences (p is less than 0.05) between fish species. E. coli was detected in three of 20 fish samples analyzed and E. coli count ranged from 1.11 to 1.72 log10 CFU cmE-2. Overall 11 from 20 fish samples tested were positive for L. monocytogenes. However, all the samples were negative for Salmonella. This study demonstrates that high total bacterial count and Enterobacteriaceae numbers were determined in raw fish samples, as well as raw fish at retail level can serve as the potential reservoirs of L. monocytogenes.
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