Artificial light and season affects vertical distribution and swimming behaviour of post‐smolt Atlantic salmon in sea cages
In winter, post‐smolts of Atlantic salmon Salmo salar exposed to continuous additional light of different intensities (LL) in 14 m deep sea cages maintained a constant swimming speed in circular polarized schools with maximum fish density in the warmest water layers at 11 m depth. By contrast, fish...
Published in: | Journal of Fish Biology |
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Language: | English |
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crwiley:10.1111/j.1095-8649.2001.tb02313.x 2024-06-02T08:03:28+00:00 Artificial light and season affects vertical distribution and swimming behaviour of post‐smolt Atlantic salmon in sea cages Oppedal, F. Juell, J‐E. Tarranger, G. L. Hansen, T. 2001 http://dx.doi.org/10.1111/j.1095-8649.2001.tb02313.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1095-8649.2001.tb02313.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1095-8649.2001.tb02313.x en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Journal of Fish Biology volume 58, issue 6, page 1570-1584 ISSN 0022-1112 1095-8649 journal-article 2001 crwiley https://doi.org/10.1111/j.1095-8649.2001.tb02313.x 2024-05-03T10:38:00Z In winter, post‐smolts of Atlantic salmon Salmo salar exposed to continuous additional light of different intensities (LL) in 14 m deep sea cages maintained a constant swimming speed in circular polarized schools with maximum fish density in the warmest water layers at 11 m depth. By contrast, fish exposed to natural light only (NL) ceased swimming at dusk, ascended from the warm layer to the thermocline c. 3 m depth and were more dispersed in the whole water column during the dark phase. In early spring, fish exposed to LL of medium (LL‐MED) or high (LL‐HIGH) light intensity ascended and maximum fish density was at 5 m depth. A similar ascent was delayed to late spring in both the low intensity group (LL‐LOW) and the NL group, coinciding with a shift in maximum temperature to this depth. The advanced ascent in the LL‐HIGH and LL‐MED groups is interpreted as a light‐induced shift in a seasonal rhythm of feeding motivation. In summer, most of the fish in all four treatment groups were observed in the warm and less saline 4 m surface layer. It is suggested that the seasonal and diel changes in vertical distribution of Atlantic salmon are related inversely to feeding motivation, with preferences for maximum temperature and darkness acting as modifying factors. Article in Journal/Newspaper Atlantic salmon Salmo salar Wiley Online Library Journal of Fish Biology 58 6 1570 1584 |
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Open Polar |
collection |
Wiley Online Library |
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crwiley |
language |
English |
description |
In winter, post‐smolts of Atlantic salmon Salmo salar exposed to continuous additional light of different intensities (LL) in 14 m deep sea cages maintained a constant swimming speed in circular polarized schools with maximum fish density in the warmest water layers at 11 m depth. By contrast, fish exposed to natural light only (NL) ceased swimming at dusk, ascended from the warm layer to the thermocline c. 3 m depth and were more dispersed in the whole water column during the dark phase. In early spring, fish exposed to LL of medium (LL‐MED) or high (LL‐HIGH) light intensity ascended and maximum fish density was at 5 m depth. A similar ascent was delayed to late spring in both the low intensity group (LL‐LOW) and the NL group, coinciding with a shift in maximum temperature to this depth. The advanced ascent in the LL‐HIGH and LL‐MED groups is interpreted as a light‐induced shift in a seasonal rhythm of feeding motivation. In summer, most of the fish in all four treatment groups were observed in the warm and less saline 4 m surface layer. It is suggested that the seasonal and diel changes in vertical distribution of Atlantic salmon are related inversely to feeding motivation, with preferences for maximum temperature and darkness acting as modifying factors. |
format |
Article in Journal/Newspaper |
author |
Oppedal, F. Juell, J‐E. Tarranger, G. L. Hansen, T. |
spellingShingle |
Oppedal, F. Juell, J‐E. Tarranger, G. L. Hansen, T. Artificial light and season affects vertical distribution and swimming behaviour of post‐smolt Atlantic salmon in sea cages |
author_facet |
Oppedal, F. Juell, J‐E. Tarranger, G. L. Hansen, T. |
author_sort |
Oppedal, F. |
title |
Artificial light and season affects vertical distribution and swimming behaviour of post‐smolt Atlantic salmon in sea cages |
title_short |
Artificial light and season affects vertical distribution and swimming behaviour of post‐smolt Atlantic salmon in sea cages |
title_full |
Artificial light and season affects vertical distribution and swimming behaviour of post‐smolt Atlantic salmon in sea cages |
title_fullStr |
Artificial light and season affects vertical distribution and swimming behaviour of post‐smolt Atlantic salmon in sea cages |
title_full_unstemmed |
Artificial light and season affects vertical distribution and swimming behaviour of post‐smolt Atlantic salmon in sea cages |
title_sort |
artificial light and season affects vertical distribution and swimming behaviour of post‐smolt atlantic salmon in sea cages |
publisher |
Wiley |
publishDate |
2001 |
url |
http://dx.doi.org/10.1111/j.1095-8649.2001.tb02313.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1095-8649.2001.tb02313.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1095-8649.2001.tb02313.x |
genre |
Atlantic salmon Salmo salar |
genre_facet |
Atlantic salmon Salmo salar |
op_source |
Journal of Fish Biology volume 58, issue 6, page 1570-1584 ISSN 0022-1112 1095-8649 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/j.1095-8649.2001.tb02313.x |
container_title |
Journal of Fish Biology |
container_volume |
58 |
container_issue |
6 |
container_start_page |
1570 |
op_container_end_page |
1584 |
_version_ |
1800748003790684160 |