| 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. |
| Genre: | Article |
| ProdID: | 70026152 |
| Citation Author: | Letcher, B. H.; Gries, G. |
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| Citation End Page: | 114 |
| Citation Issue: | 1 |
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| Citation Language: | English |
| Citation Larger Work Title: | Journal of Fish Biology |
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| Citation Number Of Pages: | 18 |
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| Citation Search Results Text: | Effects of life history variation on size and growth in stream-dwelling Atlantic salmon; 2003; Article; Journal; Journal of Fish Biology; Letcher, B. H.; Gries, G. |
| Citation Start Page: | 97 |
| Citation Volume: | 62 |
| Citation Year: | 2003 |
| Type: | citation/reference |
| Text: | Effects of life history variation on size and growth in stream-dwelling Atlantic salmon; 2003; Article; Journal; Journal of Fish Biology; Letcher, B. H.; Gries, G. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| URL (DIGITAL OBJECT IDENTIFIER): | http://dx.doi.org/10.1046/j.1095-8649.2003.00009.x |
| Date Other: | Wed, 1 Jan 2003 00:00 -0600 |
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