Condition and performance of juvenile Atlantic salmon ( Salmo salar): effects of rearing practices on hatchery fish and comparison with wild fish
This study examined the effects of various modifications of rearing practices on hatchery-reared Atlantic salmon (Salmo salar) fingerlings and compared condition and performance of hatchery fingerlings (age 0 + ) and yearlings (age 1 + ) with those of wild-reared Atlantic salmon. Reduced fish densit...
Published in: | Canadian Journal of Fisheries and Aquatic Sciences |
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Language: | English |
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Canadian Science Publishing
1998
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Online Access: | http://dx.doi.org/10.1139/f98-003 http://www.nrcresearchpress.com/doi/pdf/10.1139/f98-003 |
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crcansciencepubl:10.1139/f98-003 2024-09-15T17:55:54+00:00 Condition and performance of juvenile Atlantic salmon ( Salmo salar): effects of rearing practices on hatchery fish and comparison with wild fish McDonald, D G Milligan, C L McFarlane, W J Croke, S Currie, S Hooke, B Angus, R B Tufts, B L Davidson, K 1998 http://dx.doi.org/10.1139/f98-003 http://www.nrcresearchpress.com/doi/pdf/10.1139/f98-003 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Fisheries and Aquatic Sciences volume 55, issue 5, page 1208-1219 ISSN 0706-652X 1205-7533 journal-article 1998 crcansciencepubl https://doi.org/10.1139/f98-003 2024-07-25T04:10:06Z This study examined the effects of various modifications of rearing practices on hatchery-reared Atlantic salmon (Salmo salar) fingerlings and compared condition and performance of hatchery fingerlings (age 0 + ) and yearlings (age 1 + ) with those of wild-reared Atlantic salmon. Reduced fish density (and increased ration) in rearing tanks promoted increased growth and condition factor and significant changes in muscle composition, including increased muscle lipid content and glycolytic enzyme activity, specfically phosphofructokinase and lactate dehydrogenase. However, these changes had no effect on anaerobic capacity. Moreover, swimming performance was poorer in fingerlings reared at low compared with normal density. Raising the water velocity from 0 to 4 cm ·s -1 (~0.7 body length ·s -1 ) had overall beneficial effects, most notably increased endurance in fixed velocity sprint tests and a reduction of ion loss in an epinephrine challenge test. Increasing velocity to 9 cm ·s -1 had no further effects. Wild fingerlings were larger with better fin quality and superior anaerobic capacity and swim performance. Even larger differences were seen between hatchery-reared and wild yearlings. It is concluded that significant changes in morphology, physiology, and muscle biochemistry of juvenile Atlantic salmon can be brought about by changing hatchery rearing conditions, but these changes are of limited effectiveness in reducing the difference between hatchery-reared and wild fish. Article in Journal/Newspaper Atlantic salmon Salmo salar Canadian Science Publishing Canadian Journal of Fisheries and Aquatic Sciences 55 5 1208 1219 |
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Canadian Science Publishing |
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crcansciencepubl |
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English |
description |
This study examined the effects of various modifications of rearing practices on hatchery-reared Atlantic salmon (Salmo salar) fingerlings and compared condition and performance of hatchery fingerlings (age 0 + ) and yearlings (age 1 + ) with those of wild-reared Atlantic salmon. Reduced fish density (and increased ration) in rearing tanks promoted increased growth and condition factor and significant changes in muscle composition, including increased muscle lipid content and glycolytic enzyme activity, specfically phosphofructokinase and lactate dehydrogenase. However, these changes had no effect on anaerobic capacity. Moreover, swimming performance was poorer in fingerlings reared at low compared with normal density. Raising the water velocity from 0 to 4 cm ·s -1 (~0.7 body length ·s -1 ) had overall beneficial effects, most notably increased endurance in fixed velocity sprint tests and a reduction of ion loss in an epinephrine challenge test. Increasing velocity to 9 cm ·s -1 had no further effects. Wild fingerlings were larger with better fin quality and superior anaerobic capacity and swim performance. Even larger differences were seen between hatchery-reared and wild yearlings. It is concluded that significant changes in morphology, physiology, and muscle biochemistry of juvenile Atlantic salmon can be brought about by changing hatchery rearing conditions, but these changes are of limited effectiveness in reducing the difference between hatchery-reared and wild fish. |
format |
Article in Journal/Newspaper |
author |
McDonald, D G Milligan, C L McFarlane, W J Croke, S Currie, S Hooke, B Angus, R B Tufts, B L Davidson, K |
spellingShingle |
McDonald, D G Milligan, C L McFarlane, W J Croke, S Currie, S Hooke, B Angus, R B Tufts, B L Davidson, K Condition and performance of juvenile Atlantic salmon ( Salmo salar): effects of rearing practices on hatchery fish and comparison with wild fish |
author_facet |
McDonald, D G Milligan, C L McFarlane, W J Croke, S Currie, S Hooke, B Angus, R B Tufts, B L Davidson, K |
author_sort |
McDonald, D G |
title |
Condition and performance of juvenile Atlantic salmon ( Salmo salar): effects of rearing practices on hatchery fish and comparison with wild fish |
title_short |
Condition and performance of juvenile Atlantic salmon ( Salmo salar): effects of rearing practices on hatchery fish and comparison with wild fish |
title_full |
Condition and performance of juvenile Atlantic salmon ( Salmo salar): effects of rearing practices on hatchery fish and comparison with wild fish |
title_fullStr |
Condition and performance of juvenile Atlantic salmon ( Salmo salar): effects of rearing practices on hatchery fish and comparison with wild fish |
title_full_unstemmed |
Condition and performance of juvenile Atlantic salmon ( Salmo salar): effects of rearing practices on hatchery fish and comparison with wild fish |
title_sort |
condition and performance of juvenile atlantic salmon ( salmo salar): effects of rearing practices on hatchery fish and comparison with wild fish |
publisher |
Canadian Science Publishing |
publishDate |
1998 |
url |
http://dx.doi.org/10.1139/f98-003 http://www.nrcresearchpress.com/doi/pdf/10.1139/f98-003 |
genre |
Atlantic salmon Salmo salar |
genre_facet |
Atlantic salmon Salmo salar |
op_source |
Canadian Journal of Fisheries and Aquatic Sciences volume 55, issue 5, page 1208-1219 ISSN 0706-652X 1205-7533 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/f98-003 |
container_title |
Canadian Journal of Fisheries and Aquatic Sciences |
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55 |
container_issue |
5 |
container_start_page |
1208 |
op_container_end_page |
1219 |
_version_ |
1810432115658981376 |