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Chemical and histological studies of wild and hatchery salmon in fresh water

Transactions of the American Fisheries Society
By: , , , and 
https://doi.org/10.1577/1548-8659(1960)89[301:CAHSOW]2.0.CO;2

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Abstract

In a study of coho salmon (Oncorhynchus kisutch), the gross chemical and histological changes occurring over a 14-month period spent in fresh water were determined. The determinations were made at 3-month intervals on: 1) hatchery-reared fish, 2) fish hatchery-reared for 3, 6, 9, and 12 months and then planted in a controlled stream for the remainder of the period; and 3) an indigenous group of wild fish in this stream. Wild fish showed high incidence of tissue damage from spinose hairs of the moth larva, Halisidota argentata. Hatchery fish were similarly affected with the severity and incidence of lesions varying directly with the time of exposure of the larvae in the wild environment. Both groups of fish were heavily parasitized by sporozoan organisms in the kidney and spinal cord. Kidney disease appeared in both wild and planted hatchery fish. The gross chemical composition of hatchery fish transformed rapidly after planting to that of the wild fish. Although the initial rate of fat loss is essentially constant for all hatchery groups after planting, fish that were hatchery reared for 9 to 12 months did not complete the transformation to the wild-type body composition by the time of downstream migration at 14 months.

Publication type Article
Publication Subtype Journal Article
Title Chemical and histological studies of wild and hatchery salmon in fresh water
Series title Transactions of the American Fisheries Society
DOI 10.1577/1548-8659(1960)89[301:CAHSOW]2.0.CO;2
Volume 89
Issue 3
Year Published 1960
Language English
Publisher American Fisheries Society
Contributing office(s) Western Fisheries Research Center
Description 7 p.
First page 301
Last page 307
Online Only (Y/N) N
Additional Online Files (Y/N) N
Google Analytic Metrics Metrics page
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