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Susceptibility of three stocks of pacific herring to viral hemorrhagic septicemia

Journal of Aquatic Animal Health

By:
, , ,
DOI: 10.1577/H09-026.1

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Abstract

Laboratory challenges using specific-pathogen-free Pacific herring Clupea pallasii from three distinct populations indicated that stock origin had no effect on susceptibility to viral hemorrhagic septicemia (VHS). All of the populations were highly susceptible to the disease upon initial exposure, with significantly greater cumulative mortalities occurring in the exposed treatment groups (56.3-64.3%) than in the unexposed control groups (0.8-9.0%). Interstock differences in cumulative mortality were not significant. The virus loads in the tissues of fish experiencing mortality were 10-10,000 times higher during the acute phase of the epizootics (day 13 postexposure) than during the recovery phase (days 30-42). Survivors of the epizootics were refractory to subsequent VHS, with reexposure of VHS survivors resulting in significantly less cumulative mortality (1.2-4.0%) than among positive controls (38.1-64.4%); interstock differences in susceptibility did not occur after reexposure. These results indicate that data from experiments designed to understand the ecology of VHS virus in a given stock of Pacific herring are broadly applicable to stocks throughout the northeastern Pacific.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Susceptibility of three stocks of pacific herring to viral hemorrhagic septicemia
Series title:
Journal of Aquatic Animal Health
DOI:
10.1577/H09-026.1
Volume
22
Issue:
1
Year Published:
2010
Language:
English
Publisher location:
Bethesda, MD
Contributing office(s):
Western Fisheries Research Center
Description:
7 p.
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Number of Pages:
7
Country:
United States