Annual variation in size-selective mortality of Atlantic salmon ( Salmo salar) fry
We investigated the size-selective mortality of Atlantic salmon (Salmo salar) fry during two consecutive summers that differed markedly in weather conditions. We sampled fry shortly after emergence in June and at the end of August to compare the distributions of back-calculated body size at hatching...
Published in: | Canadian Journal of Fisheries and Aquatic Sciences |
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Canadian Science Publishing
2001
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Online Access: | http://dx.doi.org/10.1139/f01-069 http://www.nrcresearchpress.com/doi/pdf/10.1139/f01-069 |
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crcansciencepubl:10.1139/f01-069 2024-09-15T17:55:59+00:00 Annual variation in size-selective mortality of Atlantic salmon ( Salmo salar) fry Good, S P Dodson, J J Meekan, M G Ryan, D AJ 2001 http://dx.doi.org/10.1139/f01-069 http://www.nrcresearchpress.com/doi/pdf/10.1139/f01-069 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Fisheries and Aquatic Sciences volume 58, issue 6, page 1187-1195 ISSN 0706-652X 1205-7533 journal-article 2001 crcansciencepubl https://doi.org/10.1139/f01-069 2024-07-04T04:10:02Z We investigated the size-selective mortality of Atlantic salmon (Salmo salar) fry during two consecutive summers that differed markedly in weather conditions. We sampled fry shortly after emergence in June and at the end of August to compare the distributions of back-calculated body size at hatching by examining otolith microstructure. Size-selective mortality was observed in both summers; however, the direction and strength of mortality differed. During the drought conditions of 1995, selective mortality was relatively weak and directed towards the smaller fry in the population. During the flood conditions of 1996, selective mortality was relatively strong and directed towards the larger fry of the same population. Interannual variability in size-selective mortality contributed to significant differences in the mean size of fry at the end of their first summer of life. Size-selective mortality rates estimated from the shifts in fish length at hatching observed during the first summer of life were comparable with published estimates of total mortality of Atlantic salmon fry, indicating that early mortality may be largely size selective. Mortality associated with hydroclimatic events can select against either small or large fish and is a key determinant of mean size attained by the end of the first summer of life. Article in Journal/Newspaper Atlantic salmon Salmo salar Canadian Science Publishing Canadian Journal of Fisheries and Aquatic Sciences 58 6 1187 1195 |
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Open Polar |
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Canadian Science Publishing |
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crcansciencepubl |
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English |
description |
We investigated the size-selective mortality of Atlantic salmon (Salmo salar) fry during two consecutive summers that differed markedly in weather conditions. We sampled fry shortly after emergence in June and at the end of August to compare the distributions of back-calculated body size at hatching by examining otolith microstructure. Size-selective mortality was observed in both summers; however, the direction and strength of mortality differed. During the drought conditions of 1995, selective mortality was relatively weak and directed towards the smaller fry in the population. During the flood conditions of 1996, selective mortality was relatively strong and directed towards the larger fry of the same population. Interannual variability in size-selective mortality contributed to significant differences in the mean size of fry at the end of their first summer of life. Size-selective mortality rates estimated from the shifts in fish length at hatching observed during the first summer of life were comparable with published estimates of total mortality of Atlantic salmon fry, indicating that early mortality may be largely size selective. Mortality associated with hydroclimatic events can select against either small or large fish and is a key determinant of mean size attained by the end of the first summer of life. |
format |
Article in Journal/Newspaper |
author |
Good, S P Dodson, J J Meekan, M G Ryan, D AJ |
spellingShingle |
Good, S P Dodson, J J Meekan, M G Ryan, D AJ Annual variation in size-selective mortality of Atlantic salmon ( Salmo salar) fry |
author_facet |
Good, S P Dodson, J J Meekan, M G Ryan, D AJ |
author_sort |
Good, S P |
title |
Annual variation in size-selective mortality of Atlantic salmon ( Salmo salar) fry |
title_short |
Annual variation in size-selective mortality of Atlantic salmon ( Salmo salar) fry |
title_full |
Annual variation in size-selective mortality of Atlantic salmon ( Salmo salar) fry |
title_fullStr |
Annual variation in size-selective mortality of Atlantic salmon ( Salmo salar) fry |
title_full_unstemmed |
Annual variation in size-selective mortality of Atlantic salmon ( Salmo salar) fry |
title_sort |
annual variation in size-selective mortality of atlantic salmon ( salmo salar) fry |
publisher |
Canadian Science Publishing |
publishDate |
2001 |
url |
http://dx.doi.org/10.1139/f01-069 http://www.nrcresearchpress.com/doi/pdf/10.1139/f01-069 |
genre |
Atlantic salmon Salmo salar |
genre_facet |
Atlantic salmon Salmo salar |
op_source |
Canadian Journal of Fisheries and Aquatic Sciences volume 58, issue 6, page 1187-1195 ISSN 0706-652X 1205-7533 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/f01-069 |
container_title |
Canadian Journal of Fisheries and Aquatic Sciences |
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58 |
container_issue |
6 |
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1187 |
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1195 |
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1810432204161941504 |