Norwegian Institute for Nature Research, Oslo, Norway.
Norwegian Institute for Nature Research, Trondheim, Norway.
J Fish Dis. 2021 Aug;44(8):1075-1089. doi: 10.1111/jfd.13369. Epub 2021 Apr 8.
Ninety wild Atlantic salmon, Salmo salar L., (1.5-10.3 kg) were caught in the Namsen Fjord near the mouth of River Namsen, mid-Norway, and examined for the presence and distribution of Anisakis simplex (Rudolphi, 1809 det. Krabbe, 1878) larvae by digestion of the viscera and muscles in a pepsin/HCl solution. All salmon were migrating spawners after 1-4 years of feeding in the Atlantic Ocean. All 90 Atlantic salmon had A. simplex larvae in the viscera, and all, except two, had A. simplex larvae in the musculature. The number of A. simplex larvae in each fish varied between 3 and 181, and the total mean number of nematode larvae was 44.5. The intensity of A. simplex larvae was positively correlated with increasing weight and sea age of the host. However, the proportion of larvae in the muscle fillets decreased with increasing host weight and sea age. Atlantic salmon females had more A. simplex larvae than males. In all the fish examined, 70.2% of the A. simplex larvae were found in the viscera and 29.8% in the musculature. The majority (93%) of the larvae in the musculature occurred in the hypaxial sections anterior to the anus. As A. simplex larvae commonly occur in the musculature of wild Atlantic salmon, consumption of unfrozen, raw or semi-raw musculature represents a risk for humans developing anisakiasis.
九十尾野生大西洋鲑鱼（Salmo salar L.）（1.5-10.3 公斤）在挪威中部南森峡湾（靠近南森河口）捕捞，通过胃蛋白酶/盐酸溶液消化内脏和肌肉，检查是否存在并分布有简单异尖线虫（Rudolphi，1809 det. Krabbe，1878）幼虫。所有鲑鱼都是在大西洋中经过 1-4 年摄食后洄游产卵的。90 尾大西洋鲑鱼的内脏中均有简单异尖线虫幼虫，除了两条之外，所有肌肉中均有简单异尖线虫幼虫。每条鱼中的简单异尖线虫幼虫数量在 3 到 181 之间不等，总平均线虫幼虫数为 44.5。简单异尖线虫幼虫的强度与宿主的体重和海龄呈正相关。然而，幼虫在肌肉片中的比例随着宿主体重和海龄的增加而减少。雌性大西洋鲑鱼的简单异尖线虫幼虫比雄性多。在所检查的所有鱼类中，70.2%的简单异尖线虫幼虫位于内脏中，29.8%位于肌肉中。肌肉中大多数（93%）幼虫位于肛门前方的腹侧部分。由于简单异尖线虫幼虫通常存在于野生大西洋鲑鱼的肌肉中，因此食用未经冷冻、生的或半生的肌肉会使人类患异尖线虫病的风险增加。
