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Effect of swimming activity on relative weight and body composition of juvenile rainbow trout

North American Journal of Fisheries Management

By:
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DOI: 10.1577/1548-8675(2003)023<0283:EOSAOR>2.0.CO;2

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Abstract

Fisheries managers often assess body condition using relative weight (Wr) because it provides a comparative measure of fish plumpness among individuals and populations. However, it is not known whether the morphological information that Wr summarizes reflects physiological measures, such as relative lipid reserves, in rainbow trout Oncorhynchus mykiss. The purpose of this study was to determine whether swimming activity affects either the Wr or proximate body composition of juvenile (total length, 170-260 mm) rainbow trout. When rainbow trout from a hatchery were fed ad libitum for 147 d, inactive (no current) and active (15 cm/s current velocity) fish did not differ in Wr However, inactive rainbow trout maintained relatively constant lipid levels, whereas active fish declined in lipid content. Relative weight may provide a comparable measure of body form, but it is not an accurate index of lipid content between active and inactive rainbow trout fed an excess ration. For assessing the physiological condition of rainbow trout, measurement of proximate body composition appears to be more accurate than indices based on length and weight.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Effect of swimming activity on relative weight and body composition of juvenile rainbow trout
Series title:
North American Journal of Fisheries Management
DOI:
10.1577/1548-8675(2003)023<0283:EOSAOR>2.0.CO;2
Volume
23
Issue:
1
Year Published:
2003
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
First page:
283
Last page:
289
Number of Pages:
7