The nematodes of the genus Anisakis are among the most relevant parasitic hazards in fishery products since they are responsible for human infection and allergy cases. In a food safety and epidemiological perspective, several marine hosts from different locations around Japan were examined to characterize the parasitism of Anisakis larvae. Chum salmon (Oncorhynchus keta) and Alaska pollock (Gadus chalcogrammus) showed the highest overall prevalence (100%), followed by blue mackerel (Scomber australasicus) (97.5%), Pacific cod (Gadus macrocephalus) (80%), chub mackerel (Scomber japonicus) (60.1%), Japanese flying squid (Todarodes pacificus) (17%) and Japanese pilchard (Sardinops sagax melanostictus) (2%). In Pacific krill (Euphausia pacifica), apart from one Hysterothylacium aduncum larva, no Anisakis specimens were detected. Anisakis simplex sensu stricto was molecularly identified (PCR-RFLP) for the first time in Japanese flying squid and Japanese pilchard distributed in the Northwestern Pacific ocean. That was the most frequent parasitic species detected followed by A. pegreffii, mostly in the western areas of Japan, hybrid genotypes between the two sibling species as well as A. typica and A. berlandi. Surprisingly, A. simplex s.s. was the most abundant species in one batch of chub mackerel from the East China Sea and A. pegreffii was the main species found in one batch from the Pacific coast of Aomori, which seems to indicate that the ranges of these two sibling species might be more variable than previously thought.

Anisakis属的线虫是渔业产品中最相关的寄生虫危害之一，因为它们引起人类感染和过敏。从食品安全和流行病学的角度出发，对日本各地不同地点的几名海洋寄主进行了研究，以鉴定Anisakis幼虫的寄生性。鲑鱼（Oncorhynchus keta）和阿拉斯加鳕（Gadus chalcogrammus）的总体流行率最高（100％），其次是蓝鲭鱼（Scomber australasicus）（97.5％），太平洋鳕鱼（Gadus macrocephalus）（80％），chu鱼com（60.1％），日本乌贼（Todarodes pacificus）（17％）和日本沙丁鱼（Sardinops sagax melanostictus）（2％）。在太平洋磷虾（Euphausia pacifica）中，除了一只one仓蛾幼虫以外，没有发现Anisakis标本。首次在日本洋鱿鱼和分布在西北太平洋的日本沙丁鱼中首次鉴定了Anisakis simplex sensu stricto（PCR-RFLP）。那是被发现的最常见的寄生菌种，其次是佩格里菲氏菌（A. pegreffii），主要发生在日本西部地区，这是两个同胞物种之间的杂种基因型，以及典型的A. typica和A. berlandi。令人惊讶的是，A。simplex ss。是东海青鲭鱼中最丰富的物种，而A. pegreffii是青森太平洋海岸的一批中发现的主要物种，这似乎表明这两个兄弟姐妹物种的范围可能更大。比以前想像的多变。