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Parasites and hepatic lesions among pink salmon, Oncorhynchus gorbuscha (Walbaum), during early seawater residence.
MedLine Citation:
PMID:  22233513     Owner:  NLM     Status:  In-Data-Review    
Abstract/OtherAbstract:
Juvenile pink salmon, Oncorhynchus gorbuscha (Walbaum), in the Broughton Archipelago region of western Canada were surveyed over 2 years for sea lice (Lepeophtheirus salmonis and Caligus clemensi), gross and microscopic lesions and evidence of infections with viruses and bacteria. The 1071 fish examined had an approximate ocean residence time no longer than 3 months. A high prevalence of degenerative liver lesions, renal myxosporean parasites and a low prevalence of skin lesions and sea lice were observed. No indications of viral or bacterial diseases were detected in either year. The monthly prevalence of sea lice in 2007 (18-51%) was higher than in 2008 (1-26%), and the infestation density exceeded the lethal threshold in only two fish. Degenerative hepatic lesions and renal myxosporean parasites occurred in approximately 40% of the pink salmon examined in June of both years, and the peak monthly prevalence of hepatocellular hydropic degeneration was greater in 2007 (32%, in May) than in 2008 (12%, in June). Logistic regression analysis found skin lesions and hepatocellular hydropic degeneration significantly associated with sea lice. Most parasites and lesions occurred during both years, but the prevalence was often higher in 2007. Fish weight was 35% less in June 2007 than in June 2008, but condition factor was not different. Further research is required to monitor inter-annual variations and aetiology of the liver lesions and to assess their potential role on pink salmon survival.
Authors:
S M Saksida; G D Marty; S R M Jones; H A Manchester; C L Diamond; J Bidulka; S St-Hilaire
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Journal of fish diseases     Volume:  35     ISSN:  1365-2761     ISO Abbreviation:  J. Fish Dis.     Publication Date:  2012 Feb 
Date Detail:
Created Date:  2012-01-11     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9881188     Medline TA:  J Fish Dis     Country:  England    
Other Details:
Languages:  eng     Pagination:  137-51     Citation Subset:  IM    
Copyright Information:
© 2012 Blackwell Publishing Ltd.
Affiliation:
British Columbia Centre for Aquatic Health Sciences, Campbell River, BC, Canada  Animal Health Centre, Ministry of Agriculture, Abbotsford, BC, Canada  Pacific Biological Station, Fisheries and Oceans Canada, Nanaimo, BC, Canada  Fish Health Unit, Ministry of Agriculture, Courtenay, BC, Canada  Department of Health Management, Atlantic Veterinary College, University of Prince Edward Island, Charlottetown, PEI, Canada.
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