Increased Growth Rate in Atlantic Salmon Parr ( Salmo salar ) by Using a Two-Coloured Diet
Fishes hunting by sight are known to pay a cost of confusion when faced with high densities of uniform food particles. Factors such as swarm size, density, and visual uniformity increase confusion. Therefore, it may be profitable in pisciculture to introduce food particles in low densities or to red...
Published in: | Canadian Journal of Fisheries and Aquatic Sciences |
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Canadian Science Publishing
1987
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Online Access: | http://dx.doi.org/10.1139/f87-128 http://www.nrcresearchpress.com/doi/pdf/10.1139/f87-128 |
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crcansciencepubl:10.1139/f87-128 2024-04-07T07:51:04+00:00 Increased Growth Rate in Atlantic Salmon Parr ( Salmo salar ) by Using a Two-Coloured Diet Jakobsen, Per Johan Johnsen, Geir Helge Holm, Jens Christian 1987 http://dx.doi.org/10.1139/f87-128 http://www.nrcresearchpress.com/doi/pdf/10.1139/f87-128 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Fisheries and Aquatic Sciences volume 44, issue 5, page 1079-1082 ISSN 0706-652X 1205-7533 Aquatic Science Ecology, Evolution, Behavior and Systematics journal-article 1987 crcansciencepubl https://doi.org/10.1139/f87-128 2024-03-08T00:37:36Z Fishes hunting by sight are known to pay a cost of confusion when faced with high densities of uniform food particles. Factors such as swarm size, density, and visual uniformity increase confusion. Therefore, it may be profitable in pisciculture to introduce food particles in low densities or to reduce the uniformity and density of each type of feed pellet. This was tested by feeding Atlantic salmon parr (Salmo salar) brown pellets, yellow pellets, or a mixed diet. Mean growth rates were significantly higher for those fish fed a mixed diet. Of the smaller fish in all groups, those in the mixed diet group showed the highest weight/length ratio. We suggest that small individuals have to pay more attention to conspecifics than do large ones, and thus tolerate less confusion when feeding. Larger individuals, tolerating higher confusion costs, achieve higher feeding rates in high densities of uniform feed pellets. Article in Journal/Newspaper Atlantic salmon Salmo salar Canadian Science Publishing Canadian Journal of Fisheries and Aquatic Sciences 44 5 1079 1082 |
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Open Polar |
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Canadian Science Publishing |
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crcansciencepubl |
language |
English |
topic |
Aquatic Science Ecology, Evolution, Behavior and Systematics |
spellingShingle |
Aquatic Science Ecology, Evolution, Behavior and Systematics Jakobsen, Per Johan Johnsen, Geir Helge Holm, Jens Christian Increased Growth Rate in Atlantic Salmon Parr ( Salmo salar ) by Using a Two-Coloured Diet |
topic_facet |
Aquatic Science Ecology, Evolution, Behavior and Systematics |
description |
Fishes hunting by sight are known to pay a cost of confusion when faced with high densities of uniform food particles. Factors such as swarm size, density, and visual uniformity increase confusion. Therefore, it may be profitable in pisciculture to introduce food particles in low densities or to reduce the uniformity and density of each type of feed pellet. This was tested by feeding Atlantic salmon parr (Salmo salar) brown pellets, yellow pellets, or a mixed diet. Mean growth rates were significantly higher for those fish fed a mixed diet. Of the smaller fish in all groups, those in the mixed diet group showed the highest weight/length ratio. We suggest that small individuals have to pay more attention to conspecifics than do large ones, and thus tolerate less confusion when feeding. Larger individuals, tolerating higher confusion costs, achieve higher feeding rates in high densities of uniform feed pellets. |
format |
Article in Journal/Newspaper |
author |
Jakobsen, Per Johan Johnsen, Geir Helge Holm, Jens Christian |
author_facet |
Jakobsen, Per Johan Johnsen, Geir Helge Holm, Jens Christian |
author_sort |
Jakobsen, Per Johan |
title |
Increased Growth Rate in Atlantic Salmon Parr ( Salmo salar ) by Using a Two-Coloured Diet |
title_short |
Increased Growth Rate in Atlantic Salmon Parr ( Salmo salar ) by Using a Two-Coloured Diet |
title_full |
Increased Growth Rate in Atlantic Salmon Parr ( Salmo salar ) by Using a Two-Coloured Diet |
title_fullStr |
Increased Growth Rate in Atlantic Salmon Parr ( Salmo salar ) by Using a Two-Coloured Diet |
title_full_unstemmed |
Increased Growth Rate in Atlantic Salmon Parr ( Salmo salar ) by Using a Two-Coloured Diet |
title_sort |
increased growth rate in atlantic salmon parr ( salmo salar ) by using a two-coloured diet |
publisher |
Canadian Science Publishing |
publishDate |
1987 |
url |
http://dx.doi.org/10.1139/f87-128 http://www.nrcresearchpress.com/doi/pdf/10.1139/f87-128 |
genre |
Atlantic salmon Salmo salar |
genre_facet |
Atlantic salmon Salmo salar |
op_source |
Canadian Journal of Fisheries and Aquatic Sciences volume 44, issue 5, page 1079-1082 ISSN 0706-652X 1205-7533 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/f87-128 |
container_title |
Canadian Journal of Fisheries and Aquatic Sciences |
container_volume |
44 |
container_issue |
5 |
container_start_page |
1079 |
op_container_end_page |
1082 |
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1795665913126584320 |