Effects of life history variation on size and growth in stream-dwelling Atlantic salmon
Journal of Fish Biology
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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.
Suggested Citation
Letcher, B., Gries, G., 2003, Effects of life history variation on size and growth in stream-dwelling Atlantic salmon: Journal of Fish Biology, v. 62, no. 1, p. 97-114, https://doi.org/10.1046/j.1095-8649.2003.00009.x.
| 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 |
| Publication Date | February 12, 2003 |
| 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 |