Sources of variation in age at smolting in hatchery-reared Atlantic salmon ( Salmo salar )
Length-frequency distributions of Atlantic salmon parr are bimodal during the first November post-hatch and the proportion of presumptive 1 + smolts (S1) can be estimated by integrating the area under the upper modal curve. Such proportions were found for a total of 179 full-sib families of approxim...
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Language: | English |
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Canadian Science Publishing
1994
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Online Access: | http://dx.doi.org/10.4141/cjas94-031 http://www.nrcresearchpress.com/doi/pdf/10.4141/cjas94-031 |
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crcansciencepubl:10.4141/cjas94-031 2023-12-17T10:27:18+01:00 Sources of variation in age at smolting in hatchery-reared Atlantic salmon ( Salmo salar ) Bailey, J. K. Friars, G. W. 1994 http://dx.doi.org/10.4141/cjas94-031 http://www.nrcresearchpress.com/doi/pdf/10.4141/cjas94-031 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Animal Science volume 74, issue 2, page 223-227 ISSN 0008-3984 1918-1825 Animal Science and Zoology Food Animals journal-article 1994 crcansciencepubl https://doi.org/10.4141/cjas94-031 2023-11-19T13:39:06Z Length-frequency distributions of Atlantic salmon parr are bimodal during the first November post-hatch and the proportion of presumptive 1 + smolts (S1) can be estimated by integrating the area under the upper modal curve. Such proportions were found for a total of 179 full-sib families of approximately 1000 fish per family. Variance between families suggested genetic effects although an unbiased estimate of heritability was not obtainable because of the experimental design. Correlations between length measurements in July and November were significantly (P < 0.01) greater than zero and families, with a mean length advantage in the lower size mode, also tended to produce larger fish in the upper mode. There was a negative correlation (P < 0.07) between mean length in July and the proportion of presumptive 1 + smolts. Thus, while selection for increased size during July would be expected to produce a positive, correlated growth response in both modes in November, a decrease in the number of 1 + smolts would be expected. Key words: Salmon, smolting age, Salmo salar, hatchery Article in Journal/Newspaper Atlantic salmon Salmo salar Canadian Science Publishing (via Crossref) Canadian Journal of Animal Science 74 2 223 227 |
institution |
Open Polar |
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Canadian Science Publishing (via Crossref) |
op_collection_id |
crcansciencepubl |
language |
English |
topic |
Animal Science and Zoology Food Animals |
spellingShingle |
Animal Science and Zoology Food Animals Bailey, J. K. Friars, G. W. Sources of variation in age at smolting in hatchery-reared Atlantic salmon ( Salmo salar ) |
topic_facet |
Animal Science and Zoology Food Animals |
description |
Length-frequency distributions of Atlantic salmon parr are bimodal during the first November post-hatch and the proportion of presumptive 1 + smolts (S1) can be estimated by integrating the area under the upper modal curve. Such proportions were found for a total of 179 full-sib families of approximately 1000 fish per family. Variance between families suggested genetic effects although an unbiased estimate of heritability was not obtainable because of the experimental design. Correlations between length measurements in July and November were significantly (P < 0.01) greater than zero and families, with a mean length advantage in the lower size mode, also tended to produce larger fish in the upper mode. There was a negative correlation (P < 0.07) between mean length in July and the proportion of presumptive 1 + smolts. Thus, while selection for increased size during July would be expected to produce a positive, correlated growth response in both modes in November, a decrease in the number of 1 + smolts would be expected. Key words: Salmon, smolting age, Salmo salar, hatchery |
format |
Article in Journal/Newspaper |
author |
Bailey, J. K. Friars, G. W. |
author_facet |
Bailey, J. K. Friars, G. W. |
author_sort |
Bailey, J. K. |
title |
Sources of variation in age at smolting in hatchery-reared Atlantic salmon ( Salmo salar ) |
title_short |
Sources of variation in age at smolting in hatchery-reared Atlantic salmon ( Salmo salar ) |
title_full |
Sources of variation in age at smolting in hatchery-reared Atlantic salmon ( Salmo salar ) |
title_fullStr |
Sources of variation in age at smolting in hatchery-reared Atlantic salmon ( Salmo salar ) |
title_full_unstemmed |
Sources of variation in age at smolting in hatchery-reared Atlantic salmon ( Salmo salar ) |
title_sort |
sources of variation in age at smolting in hatchery-reared atlantic salmon ( salmo salar ) |
publisher |
Canadian Science Publishing |
publishDate |
1994 |
url |
http://dx.doi.org/10.4141/cjas94-031 http://www.nrcresearchpress.com/doi/pdf/10.4141/cjas94-031 |
genre |
Atlantic salmon Salmo salar |
genre_facet |
Atlantic salmon Salmo salar |
op_source |
Canadian Journal of Animal Science volume 74, issue 2, page 223-227 ISSN 0008-3984 1918-1825 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.4141/cjas94-031 |
container_title |
Canadian Journal of Animal Science |
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74 |
container_issue |
2 |
container_start_page |
223 |
op_container_end_page |
227 |
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1785579121354473472 |