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Effects of life history variation on size and growth in stream-dwelling Atlantic salmon

Journal of Fish Biology

By:
and
DOI: 10.1046/j.1095-8649.2003.00009.x

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Abstract

A large size variation amongst life histories for stream-dwelling Atlantic salmon Salmo salar was found and the relative effect of life histories on size varied over time. As early as December (age 0+ years), fish that later smolted at age 2+ years were significantly larger than fish that did not smolt at age 2+ years. In contrast, there were no mass differences at age 0+ years between fish that would mature or not at age 1+ years (October). The mass differences between smolts and non-smolts persisted until smolting, and differences between mature and immature fish first appeared in May (age 1+ years). Following September (age 1+ years), there was also a significant interaction between smolting and maturity. Previously mature and immature age 2+ year smolts were not significantly different in size, but immature age 2+ year non-smolts were much lighter than mature age 2+ year non-smolts. Based on mass differences, the apparent 'decision' to smolt occurred c. 5 months before (winter, age 0+ years) the decision to mature (late spring, age 1+ years). In addition to strong seasonal growth variation, sizes of freshwater Atlantic salmon were largely structured by the complex interaction between smolt-age and maturity. ?? 2003 The fisheries Society of the British Isles.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Effects of life history variation on size and growth in stream-dwelling Atlantic salmon
Series title:
Journal of Fish Biology
DOI:
10.1046/j.1095-8649.2003.00009.x
Volume
62
Issue:
1
Year Published:
2003
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Journal of Fish Biology
First page:
97
Last page:
114