Document Detail

Mortality related to pancreas disease in Norwegian farmed salmonid fish, Salmo salar L. and Oncorhynchus mykiss (Walbaum).
MedLine Citation:
PMID:  23311767     Owner:  NLM     Status:  Publisher    
High mortality during the salmonid seawater phase is a continuous problem for the salmonid aquaculture industry, although the mortality levels show a large variation both in farms with a disease history and those without. We wanted to examine the mortality patterns in farms with pancreas disease (PD) and compare it to farms without this diagnosis. Further, we wished to investigate the factors influencing the maximum mortality in both groups. We examined data from all salmonid farms in Norway stocked after January 2003 and slaughtered before December 2007. In total, 1884 cohorts were included, and 150 of these were diagnosed with PD. We found that season accounted for more of the variation in mortality than water temperature in PD-positive cohorts and that infection pressure influenced the mortality in non-PD cohorts, suggesting outbreaks of disease that are not diagnosed. We also found that the mortality in PD cohorts decreased significantly from 2003 to 2007, suggesting that increased knowledge about PD and targeted actions have been effective. Our study further suggests that crude mortality figures may be of limited use when wanting to examine a particular disease and risk factors for increased mortality. We suggest farmers and legislation should turn to a more modern approach with cause-specific mortality records.
M Stormoen; A B Kristoffersen; P A Jansen
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2013-1-13
Journal Detail:
Title:  Journal of fish diseases     Volume:  -     ISSN:  1365-2761     ISO Abbreviation:  J. Fish Dis.     Publication Date:  2013 Jan 
Date Detail:
Created Date:  2013-1-14     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9881188     Medline TA:  J Fish Dis     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
© 2013 Blackwell Publishing Ltd.
Norwegian School of Veterinary Science, Oslo, Norway.
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