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Diseases of Aquatic Organisms

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DAO 94:201-209 (2011)  -  DOI:

Anisakis simplex (s.s.) larvae in wild Alaska salmon: no indication of post-mortem migration from viscera into flesh

Horst Karl1,*, Florian Baumann2, Ute Ostermeyer1, Thomas Kuhn3, Sven Klimpel

1Department of Safety and Quality of Milk and Fish Products, Federal Research Institute for Nutrition and Food, Max Rubner-Institut, Palmaille 9, 22767 Hamburg, Germany
2Qualitätssicherung, Frozen Fish International GmbH, Am Lunedeich 115, 27572 Bremerhaven, Germany
3Biodiversity and Climate Research Centre (BiK-F), Institute for Ecology, Evolution & Diversity, Goethe University, Georg-Voigt-Str. 14–16, 60325 Frankfurt am Main, Germany

ABSTRACT: The prevalence, mean intensity and distribution of Anisakis nematode third-stage larvae (L3) in the muscle and viscera of wild-caught chum salmon Oncorhynchus keta, pink salmon O. gorbuscha and sockeye salmon O. nerka were compared immediately after catch. Salmon were collected during the fishing season in July 2007 in Bristol Bay and Prince William Sound close to Cordova, Alaska (USA). All fish were infected, and more than 90% of the nematode larvae were found in the edible muscle meat. The isolated anisakid L3 were genetically identified as A. simplex (s.s.). The distribution of nematodes in the muscle meat of fresh-caught salmon was examined in 49 O. keta, 50 O. nerka and 12 O. gorbuscha from Cordova. Most of the larvae were detected in the muscle parts around the body cavity, but nematodes were also found in the tail meat and epaxial muscle (loins). The mean intensity of Anisakis larvae in the edible part was 21 individuals for O. gorbuscha, 62 individuals for O. keta and 63 individuals for O. nerka. No difference in the intensity of Anisakis larvae in the hypaxial muscle was found between fresh-caught and immediately gutted salmon and individuals stored ungutted for 24 h either on ice or in refrigerated sea water.

KEY WORDS: Pacific salmon · Anisakis simplex (s.s.) · Muscle meat · Refrigerated sea water (RSW) storage · Onchorhynchus keta · O. nerka · O. gorbuscha

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Cite this article as: Karl H, Baumann F, Ostermeyer U, Kuhn T, Klimpel S (2011) Anisakis simplex (s.s.) larvae in wild Alaska salmon: no indication of post-mortem migration from viscera into flesh. Dis Aquat Org 94:201-209.

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