eCommons

 

Mortality Event in Spring Chinook Broodstock at an Eastern Washington Hatchery

Other Titles

Abstract

A population of Spring Chinook salmon broodstock experienced a significant mortality event while they were being held prior to spawning. The fish were being held in two raceways fed by surface water at a hatchery in Eastern Washington. Affected fish were lethargic and swimming at the surface before dying suddenly. On examination, the fish were almost ready to spawn, in good body condition but they had white to yellow tipped gills. Microscopic examination of the gills revealed numerous long flexing rod bacteria arranged in haystacks. The surviving fish were treated with Chloramine-T, a recently approved drug for use in aquaculture, the raceways were switched to well water to decrease the water temperature, and the oxygenation in the raceways was increased. Although mortality was high, some fish successfully made it to spawning with treatment. This case report discusses examination of aquacultured fish as well as potential additional treatments and prevention of Flavobacterium columnare infections in Spring Chinook salmon.

Journal / Series

Volume & Issue

Description

Sponsorship

Date Issued

2014-10-22

Publisher

Keywords

Aquaculture, Chinook salmon, fish disease, Flavobacterium columnare,

Location

Effective Date

Expiration Date

Sector

Employer

Union

Union Local

NAICS

Number of Workers

Committee Chair

Committee Co-Chair

Committee Member

Degree Discipline

Degree Name

Degree Level

Related Version

Related DOI

Related To

Related Part

Based on Related Item

Has Other Format(s)

Part of Related Item

Related To

Related Publication(s)

Link(s) to Related Publication(s)

References

Link(s) to Reference(s)

Previously Published As

Government Document

ISBN

ISMN

ISSN

Other Identifiers

Rights

Rights URI

Types

case study

Accessibility Feature

Accessibility Hazard

Accessibility Summary

Link(s) to Catalog Record