マサバ給餌飼育中のアニサキス幼虫寄生数の変化

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  • The number and prevalence of Anisakis larvae in chub mackerel Scomber japonicus on rearing fish with feeding
  • マサバキュウジ シイク チュウ ノ アニサキス ヨウチュウ キセイスウ ノ ヘンカ

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The change of the number of Anisakis larvae during rearing with feeding was preliminarily investigated in two groups of chub mackerel Scomber japonicus. In one group, the mean number of larvae significantly increased from 4.3 to 19.8 during 34 days of rearing, with the reasons unclear. In the other group, the prevalence and mean number significantly decreased from 100% and 11.1 to 50% and 0.85, respectively, during the 61-day period of 21–82 days after the beginning of rearing. All larvae were obtained only from the body cavity of fish. Among them, Anisakis pegreffii and A. simplexs. s. occupied 96.1% and 3.9% in total, respectively. In the second group of fish, the ratio of A. pegreffii decreased from 100% to 92.3% during the 61 days of rearing. The decreases in the number of larvae and the ratio of A. pegreffii in the second group suggested possible death of A. pegreffii in the body cavity of chub mackerel, although further well-designed experiments are necessary. Additionally, the presence of Anisakis larvae even after the long rearing indicated that the risk of food poisoning cannot be completely eliminated by rearing.

マサバ給餌飼育が魚体中のアニサキス幼虫寄生数に与える影響について，調査を行った。二つのマサバ飼育群のうち一つは，漁獲して21日後から82日後の61日間の間に，寄生率が100％から50％に減少し，平均寄生数は11.1から0.85に有意に減少した。虫体はすべて内臓部位から得られ，同定した全虫体のうち，96.1％がAnisakis pegreffii で，残りの3.9% がA. simplex s.s. と前者が優占した。マサバの飼育期間中にA. pegreffiiの数が大きく減少したことから，A. pegreffiiが飼育期間中に死亡した可能性が示唆された。長期飼育後もアニサキスが存在したことから，給餌飼育期間中にマサバ魚体中のアニサキス幼虫数が減少しても，食中毒リスクは完全には除去できないと考えられる。

source:2022040130

source:20230410024

source:fish-u:71-024

source:https://www.fra.affrc.go.jp/bulletin/fish_tech/14-2.html

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