Differentiation in juvenile growth and bimodality patterns between northern and southern populations of Atlantic salmon ( Salmo salar L.)
Juvenile Atlantic salmon, Salmo salar, from two contrasting populations that had been reared under identical conditions differed in freshwater growth rates and the development of bimodality in length–frequency distributions. Segregation by size started at least a month earlier in the northern (River...
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Canadian Science Publishing
1994
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crcansciencepubl:10.1139/z94-213 2024-09-15T17:55:57+00:00 Differentiation in juvenile growth and bimodality patterns between northern and southern populations of Atlantic salmon ( Salmo salar L.) Nicieza, Alfredo G. Reyes-Gavilán, Felipe G. Braña, Florentino 1994 http://dx.doi.org/10.1139/z94-213 http://www.nrcresearchpress.com/doi/pdf/10.1139/z94-213 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Zoology volume 72, issue 9, page 1603-1610 ISSN 0008-4301 1480-3283 journal-article 1994 crcansciencepubl https://doi.org/10.1139/z94-213 2024-07-18T04:13:29Z Juvenile Atlantic salmon, Salmo salar, from two contrasting populations that had been reared under identical conditions differed in freshwater growth rates and the development of bimodality in length–frequency distributions. Segregation by size started at least a month earlier in the northern (River Shin, northern Scotland) than in the southern population (River Narcea, northern Spain). Northern fish initially grew faster and entered the upper modal group at a larger size (about 100 mm) than did southern fish (about 90 mm). However, the percentage of fish in the upper modal group was greater for the southern population and they grew fastest over winter and during the spring leading up to smolting, and were larger at the smolt stage. By late winter, the individual growth rates of upper modal fish were inversely correlated with their body length in December. These results suggest the existence of genetic differences between populations in the expression of growth bimodality in juvenile Atlantic salmon. This may indicate that size and growth rate thresholds determining the developmental pathway associated with age at smolt metamorphosis may vary between populations as a function of both smolt size and expected growth opportunity during winter and spring. Article in Journal/Newspaper Atlantic salmon Salmo salar Canadian Science Publishing Canadian Journal of Zoology 72 9 1603 1610 |
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Open Polar |
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Canadian Science Publishing |
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crcansciencepubl |
language |
English |
description |
Juvenile Atlantic salmon, Salmo salar, from two contrasting populations that had been reared under identical conditions differed in freshwater growth rates and the development of bimodality in length–frequency distributions. Segregation by size started at least a month earlier in the northern (River Shin, northern Scotland) than in the southern population (River Narcea, northern Spain). Northern fish initially grew faster and entered the upper modal group at a larger size (about 100 mm) than did southern fish (about 90 mm). However, the percentage of fish in the upper modal group was greater for the southern population and they grew fastest over winter and during the spring leading up to smolting, and were larger at the smolt stage. By late winter, the individual growth rates of upper modal fish were inversely correlated with their body length in December. These results suggest the existence of genetic differences between populations in the expression of growth bimodality in juvenile Atlantic salmon. This may indicate that size and growth rate thresholds determining the developmental pathway associated with age at smolt metamorphosis may vary between populations as a function of both smolt size and expected growth opportunity during winter and spring. |
format |
Article in Journal/Newspaper |
author |
Nicieza, Alfredo G. Reyes-Gavilán, Felipe G. Braña, Florentino |
spellingShingle |
Nicieza, Alfredo G. Reyes-Gavilán, Felipe G. Braña, Florentino Differentiation in juvenile growth and bimodality patterns between northern and southern populations of Atlantic salmon ( Salmo salar L.) |
author_facet |
Nicieza, Alfredo G. Reyes-Gavilán, Felipe G. Braña, Florentino |
author_sort |
Nicieza, Alfredo G. |
title |
Differentiation in juvenile growth and bimodality patterns between northern and southern populations of Atlantic salmon ( Salmo salar L.) |
title_short |
Differentiation in juvenile growth and bimodality patterns between northern and southern populations of Atlantic salmon ( Salmo salar L.) |
title_full |
Differentiation in juvenile growth and bimodality patterns between northern and southern populations of Atlantic salmon ( Salmo salar L.) |
title_fullStr |
Differentiation in juvenile growth and bimodality patterns between northern and southern populations of Atlantic salmon ( Salmo salar L.) |
title_full_unstemmed |
Differentiation in juvenile growth and bimodality patterns between northern and southern populations of Atlantic salmon ( Salmo salar L.) |
title_sort |
differentiation in juvenile growth and bimodality patterns between northern and southern populations of atlantic salmon ( salmo salar l.) |
publisher |
Canadian Science Publishing |
publishDate |
1994 |
url |
http://dx.doi.org/10.1139/z94-213 http://www.nrcresearchpress.com/doi/pdf/10.1139/z94-213 |
genre |
Atlantic salmon Salmo salar |
genre_facet |
Atlantic salmon Salmo salar |
op_source |
Canadian Journal of Zoology volume 72, issue 9, page 1603-1610 ISSN 0008-4301 1480-3283 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/z94-213 |
container_title |
Canadian Journal of Zoology |
container_volume |
72 |
container_issue |
9 |
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1603 |
op_container_end_page |
1610 |
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1810432174832222208 |