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Laboratory challenge of Pacific herring Clupea pallasii to Vibrio anguillarum and V. ordallii

Published by U.S. Geological Survey | Department of the Interior | Catalog Last Checked: September 10, 2026 at 08:28 PM | Dataset Last Updated: August 17, 2022 at 12:00 AM
Controlled waterborne exposures of Pacific herring (Clupea pallasii) to Vibrio anguillarum and V. ordalii failed to result in overt signs of disease or mortality from vibriosis. Cumulative mortalities among Vibrio - exposed Pacific herring (3.3 - 5.0%) were similar to those of saline-exposed negative controls (10%) and significantly less (P < 0.001) than those of Vibrio - exposed Chinook salmon (60 - 97%), a known susceptible species. Gross signs of disease did not occur on any dead or surviving Pacific herring; however, exposed Chinook salmon demonstrated classic gross signs of vibriosis. The results indicate that early reports of presumed vibriosis in Pacific herring during the 1950’s were likely misdiagnosed cases of a viral disease, possibly viral hemorrhagic septicemia or viral erythrocytic necrosis, which can cause hemorrhagic lesions superficially resembling those of vibriosis.

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