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

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 se...

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Bibliographic Details
Published in:Diseases of aquatic organisms 2011-05, Vol.94 (3), p.201-209
Main Authors: KARL, Horst, BAUMANN, Florian, OSTERMEYER, Ute, KUHN, Thomas, KLIMPEL, Sven
Format: Article
Language:English
Subjects:
Animal aquaculture
Animal productions
Animals
Anisakis
Anisakis - isolation & purification
Anisakis simplex
Biological and medical sciences
Fish Diseases - parasitology
Fundamental and applied biological sciences. Psychology
Intestines - parasitology
Larva
Marine
Muscle, Skeletal - parasitology
Nematoda
Nematode Infections - veterinary
Oncorhynchus - parasitology
Oncorhynchus keta
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Summary: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.
ISSN:0177-5103
1616-1580
DOI:10.3354/dao02317