• Journal of fish pathology
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• v.23 no.1
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• pp.123-129
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• 2010

The infestation status of anisakid type larvae was investigated in migrating chum salmon (Oncorhynchus keta), with different condition (captured area, sex, body portion) during 2006~2008. The mean infection number of anisakid larvae per individual female and male fish captured from Namdae river was $98{\pm}27$, $103{\pm}27$, respectively. The mean infection number of anisakid larvae per individual female and male fish captured from the coastal area of Yangyang was $63{\pm}18$ and $108{\pm}17$, respectively. The anisakid larvae were mainly found in abdominal muscles (85%) but only a little in the visceral portion. Two types of anisakid larvae (A. simplex, Contracaecum type) were identified but other anisakid larvae were not detected. To investigate the effect of storing temperature on the viability of anisakid larvae, the section of abdominal muscle were stored at different temperature (room temperature, $4^{\circ}C$, $-20^{\circ}C$, $-80^{\circ}C$). As a result, it was necessary to store at $-20^{\circ}C$ for more than 6 hrs to kill the larvae. The present results revealed that chum salmon caught in Korea are heavily infected with anisakid larvae, mainly in the abdominal muscle, and A. simplex was dominantly found in this study.