Abstract
Sushi is a traditional Japanese food, mostly consisting of raw seafood in combination with rice. However, eating sushi has become popular among consumers in many countries outside Japan. Sushi is not free from health risks and foodborne illness linked to this product has been caused by Listeria monocytogenes. The aim of our work was to study viability of L. monocytogenes in emulated nigiri sushi comprised of halibut and salmon. Raw samples of halibut and salmon were inoculated with the pathogen and subsequently put on top of vinegar marinated sushi rice followed by storage for 7 days at 4 and 8 °C. As controls, inoculated seafood without rice was used. The experiments demonstrated that the level of L. monocytogenes in nigiri sushi was significant lower during storage over 7 days at 4 and 8 °C compared to controls, in case of inoculated seafood only. The pH drop in the fish muscle, caused by the sushi rice, is believed to be the reason for the decrease in viability of L. monocytogenes in nigiri sushi.
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