Effect of winter food deprivation on growth and sexual maturity of Atlantic salmon ( Salmo salar) in seawater
By identifying individual Atlantic salmon (Salmo salar) smolts (age 1+, mean weight 95 g), a tank study with four treatments (n = 175 fish per tank) indicated that maturation as grilse is associated with changes in somatic growth over many months, from July of the first summer in seawater onwards. T...
Published in: | Canadian Journal of Fisheries and Aquatic Sciences |
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1999
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Online Access: | http://dx.doi.org/10.1139/f98-165 http://www.nrcresearchpress.com/doi/pdf/10.1139/f98-165 |
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crcansciencepubl:10.1139/f98-165 2024-09-15T17:56:11+00:00 Effect of winter food deprivation on growth and sexual maturity of Atlantic salmon ( Salmo salar) in seawater Duston, J Saunders, R L 1999 http://dx.doi.org/10.1139/f98-165 http://www.nrcresearchpress.com/doi/pdf/10.1139/f98-165 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Fisheries and Aquatic Sciences volume 56, issue 2, page 201-207 ISSN 0706-652X 1205-7533 journal-article 1999 crcansciencepubl https://doi.org/10.1139/f98-165 2024-08-08T04:13:37Z By identifying individual Atlantic salmon (Salmo salar) smolts (age 1+, mean weight 95 g), a tank study with four treatments (n = 175 fish per tank) indicated that maturation as grilse is associated with changes in somatic growth over many months, from July of the first summer in seawater onwards. The grilse rate in both sexes was associated with a relatively high condition factor from July onwards, but was independent of fork length. Food deprivation in either early winter (November-December, 8.2-4.1°C), late winter (February-April, 0.7-4.0°C), or both early and late winter (double deprived) reduced the female grilse rate (p < 0.01) to 4, 7, and 2% versus 18% in the control, whereas male grilse rate was reduced by a lesser degree (p > 0.05), 43, 39, and 33% versus 44% in the control. Mean condition factor among both maturing and immature fish decreased by a similar degree due to food deprivation but from spring onwards increased by a faster rate among incipient grilse. In a large experiment in four sea cages (each n = 3885 fish) using similar food deprivation treatments, the reduction in grilse rate was statistically significant in both sexes: among males, 28-36 versus 43% in the control; among females, 3-4 versus 6% in the control. Article in Journal/Newspaper Atlantic salmon Salmo salar Canadian Science Publishing Canadian Journal of Fisheries and Aquatic Sciences 56 2 201 207 |
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Canadian Science Publishing |
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English |
description |
By identifying individual Atlantic salmon (Salmo salar) smolts (age 1+, mean weight 95 g), a tank study with four treatments (n = 175 fish per tank) indicated that maturation as grilse is associated with changes in somatic growth over many months, from July of the first summer in seawater onwards. The grilse rate in both sexes was associated with a relatively high condition factor from July onwards, but was independent of fork length. Food deprivation in either early winter (November-December, 8.2-4.1°C), late winter (February-April, 0.7-4.0°C), or both early and late winter (double deprived) reduced the female grilse rate (p < 0.01) to 4, 7, and 2% versus 18% in the control, whereas male grilse rate was reduced by a lesser degree (p > 0.05), 43, 39, and 33% versus 44% in the control. Mean condition factor among both maturing and immature fish decreased by a similar degree due to food deprivation but from spring onwards increased by a faster rate among incipient grilse. In a large experiment in four sea cages (each n = 3885 fish) using similar food deprivation treatments, the reduction in grilse rate was statistically significant in both sexes: among males, 28-36 versus 43% in the control; among females, 3-4 versus 6% in the control. |
format |
Article in Journal/Newspaper |
author |
Duston, J Saunders, R L |
spellingShingle |
Duston, J Saunders, R L Effect of winter food deprivation on growth and sexual maturity of Atlantic salmon ( Salmo salar) in seawater |
author_facet |
Duston, J Saunders, R L |
author_sort |
Duston, J |
title |
Effect of winter food deprivation on growth and sexual maturity of Atlantic salmon ( Salmo salar) in seawater |
title_short |
Effect of winter food deprivation on growth and sexual maturity of Atlantic salmon ( Salmo salar) in seawater |
title_full |
Effect of winter food deprivation on growth and sexual maturity of Atlantic salmon ( Salmo salar) in seawater |
title_fullStr |
Effect of winter food deprivation on growth and sexual maturity of Atlantic salmon ( Salmo salar) in seawater |
title_full_unstemmed |
Effect of winter food deprivation on growth and sexual maturity of Atlantic salmon ( Salmo salar) in seawater |
title_sort |
effect of winter food deprivation on growth and sexual maturity of atlantic salmon ( salmo salar) in seawater |
publisher |
Canadian Science Publishing |
publishDate |
1999 |
url |
http://dx.doi.org/10.1139/f98-165 http://www.nrcresearchpress.com/doi/pdf/10.1139/f98-165 |
genre |
Atlantic salmon Salmo salar |
genre_facet |
Atlantic salmon Salmo salar |
op_source |
Canadian Journal of Fisheries and Aquatic Sciences volume 56, issue 2, page 201-207 ISSN 0706-652X 1205-7533 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/f98-165 |
container_title |
Canadian Journal of Fisheries and Aquatic Sciences |
container_volume |
56 |
container_issue |
2 |
container_start_page |
201 |
op_container_end_page |
207 |
_version_ |
1810432392848998400 |