NDLI: Anisakids (Nematoda: Anisakidae) from stomachs of northern fur seals (Callorhinus ursinus) on St. Paul Island, Alaska: parasitological and pathological analysis

Content Provider	Springer Nature Link
Author	Kuzmina, T. A. Lyons, E. T. Spraker, T. R.
Copyright Year	2014
Abstract	Anisakid nematodes parasitize the alimentary tracts of aquatic vertebrates, including northern fur seals (Callorhinus ursinus) (NFS). The main purpose of this study was to estimate the prevalence, intensity, and species composition of anisakids in NFSs on St. Paul Island, Alaska, and to analyze changes in NFS infection with these nematodes during the last decades. The study was carried out on St. Paul Island, Alaska, in July–August 2011–2013. Stomachs of 443 humanely harvested NFS males were collected from five separate haul-out areas. A total of 4,460 anisakid specimens were collected and identified by morphological criteria. Gross and histological examinations of stomachs were also performed. The overall prevalence of NFS infection was 91.2 %; overall mean intensity 10.9, and overall median intensity 6. Five species, Anisakis simplex s. l., Contracaecum osculatum s. l., Pseudoterranova decipiens s. l., P. azarazi and Phocascaris cystophorae, were found. The prevalence of Anisakis was 46.5 %, its intensity 7.5. The prevalence and intensity of Contracaecum, Pseudoterranova, and Phocascaris were 33.6 % and 3.5, 81.9 % and 6.5, and 5.2 % and 1.7, respectively. Significant differences in the prevalence of NFS infection were observed between separate haul-outs. Comparison of the present data with the results of studies performed in the North Pacific in the 1960s, showed a significant decrease in the intensity of NFS infection with anisakids during the last decades. The prevalence of mucosal lesions in NFS stomachs caused by anisakids also decreased from 92 to 20.9 %. Possible reasons for the changes in NFS infection with anisakids are discussed.
Starting Page	4463
Ending Page	4470
Page Count	8
File Format	PDF
ISSN	09320113
Journal	Parasitology Research
Volume Number	113
Issue Number	12
e-ISSN	14321955
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2014-09-14
Publisher Place	Berlin/Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Anisakidae Northern fur seals Callorhinus ursinus St. Paul Island Alaska Medical Microbiology Microbiology Immunology
Content Type	Text
Resource Type	Article
Subject	Infectious Diseases Veterinary Parasitology Insect Science

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