Pathogens associated with impounded Pacific herring Clupea harengus pallasi, with emphasis on viral erythrocytic necrosis (VEN) and atypical Aeromonas salmonicida

Publisher Website
Google Scholar
Abstract
Maturing Pacific herring (Clupea harengus pallasi Valenciennes) were captured and held in net pens at Departure Bay, British Columbia (Canada), to test the quality and timing of roe production. The health status of the impounded herring was regularly monitored during the 5 mo holding period. Viral erythrocytic necrosis (VEN) increased in the captive herring from an initial prevalence of 3% to 70% near the termination of holding. Bacteria isolated from kidneys of randomly sampled herring were tested for pathogenicity in juvenile herring. Significantly, 4 particularly virulent isolates were characterized as atypical Aeromonas salmonicida. Related experiments with herring in the laboratory indicated that they were capable of harbouring the important salmonid kidney disease pathogen Renibacterium salmoninarum for extended periods. In addition, 2 yr old herring (vaccinated parenterally with formalin-killed Vibrio anguillarum in adjuvant) failed to produce homologous serum agglutinins in 6 wk although chinook salmon (Oncorhynchus tshawytscha) similarly vaccinated developed high agglutinin titres.
Keywords

This publication has 0 references indexed in Scilit: