Oxygen gradients affect behaviour of caged Atlantic salmon Salmo salar
Dissolved oxygen (DO) conditions in marine aquaculture cages are heterogeneous and fluctuate rapidly. Here, by temporarily wrapping a tarpaulin around the top 0 to 6 m of a marine cage (~2000 m3), we manipulated DO to evaluate the behavioural response of Atlantic salmon Salmo salar to hypoxia. Video...
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Online Access: | http://hdl.handle.net/11250/2477897 https://doi.org/10.3354/aei00219 |
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ftimr:oai:imr.brage.unit.no:11250/2477897 2023-05-15T15:31:38+02:00 Oxygen gradients affect behaviour of caged Atlantic salmon Salmo salar Oldham, Tina Dempster, Tim Fosse, Jan Olav Oppedal, Frode 2017 application/pdf http://hdl.handle.net/11250/2477897 https://doi.org/10.3354/aei00219 eng eng Aquaculture Environment Interactions. 2017, 9 (1), 145-153. urn:issn:1869-215X http://hdl.handle.net/11250/2477897 https://doi.org/10.3354/aei00219 cristin:1541932 145-153 9 Aquaculture Environment Interactions 1 Peer reviewed Journal article 2017 ftimr https://doi.org/10.3354/aei00219 2021-09-23T20:14:26Z Dissolved oxygen (DO) conditions in marine aquaculture cages are heterogeneous and fluctuate rapidly. Here, by temporarily wrapping a tarpaulin around the top 0 to 6 m of a marine cage (~2000 m3), we manipulated DO to evaluate the behavioural response of Atlantic salmon Salmo salar to hypoxia. Videos were recorded before, during and after DO manipulation at 3 m depth while vertical profiles of temperature, salinity, DO and fish density were continuously measured. The trial was repeated 4 times over a 2 wk period. Temperature and salinity profiles varied little across treatment periods; however, DO saturation was reduced at all depths in all replicate trials during the tarpaulin treatment compared to the periods before or after. In 3 out of 4 trials, swim speeds were 1.5 to 2.7 times slower during the tarpaulin treatment than the before or after periods. Significant changes in vertical distribution of fish density and DO were observed between treatment periods in all replicate trials; salmon swam either above or below the most hypoxic depth layer (59 to 62% DO saturation). In a regression tree analysis, the relative influence of DO in determining fish distribution was 17%, while temperature (39%) and salinity (44%) explained the majority of variation. Our results demonstrate that salmon are capable of modifying their distribution and possibly activity levels in response to intermediate DO levels, but that DO is not a primary driver of behaviour at the saturation levels examined in this study. publishedVersion Article in Journal/Newspaper Atlantic salmon Salmo salar Institute for Marine Research: Brage IMR Aquaculture Environment Interactions 9 145 153 |
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Open Polar |
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Institute for Marine Research: Brage IMR |
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language |
English |
description |
Dissolved oxygen (DO) conditions in marine aquaculture cages are heterogeneous and fluctuate rapidly. Here, by temporarily wrapping a tarpaulin around the top 0 to 6 m of a marine cage (~2000 m3), we manipulated DO to evaluate the behavioural response of Atlantic salmon Salmo salar to hypoxia. Videos were recorded before, during and after DO manipulation at 3 m depth while vertical profiles of temperature, salinity, DO and fish density were continuously measured. The trial was repeated 4 times over a 2 wk period. Temperature and salinity profiles varied little across treatment periods; however, DO saturation was reduced at all depths in all replicate trials during the tarpaulin treatment compared to the periods before or after. In 3 out of 4 trials, swim speeds were 1.5 to 2.7 times slower during the tarpaulin treatment than the before or after periods. Significant changes in vertical distribution of fish density and DO were observed between treatment periods in all replicate trials; salmon swam either above or below the most hypoxic depth layer (59 to 62% DO saturation). In a regression tree analysis, the relative influence of DO in determining fish distribution was 17%, while temperature (39%) and salinity (44%) explained the majority of variation. Our results demonstrate that salmon are capable of modifying their distribution and possibly activity levels in response to intermediate DO levels, but that DO is not a primary driver of behaviour at the saturation levels examined in this study. publishedVersion |
format |
Article in Journal/Newspaper |
author |
Oldham, Tina Dempster, Tim Fosse, Jan Olav Oppedal, Frode |
spellingShingle |
Oldham, Tina Dempster, Tim Fosse, Jan Olav Oppedal, Frode Oxygen gradients affect behaviour of caged Atlantic salmon Salmo salar |
author_facet |
Oldham, Tina Dempster, Tim Fosse, Jan Olav Oppedal, Frode |
author_sort |
Oldham, Tina |
title |
Oxygen gradients affect behaviour of caged Atlantic salmon Salmo salar |
title_short |
Oxygen gradients affect behaviour of caged Atlantic salmon Salmo salar |
title_full |
Oxygen gradients affect behaviour of caged Atlantic salmon Salmo salar |
title_fullStr |
Oxygen gradients affect behaviour of caged Atlantic salmon Salmo salar |
title_full_unstemmed |
Oxygen gradients affect behaviour of caged Atlantic salmon Salmo salar |
title_sort |
oxygen gradients affect behaviour of caged atlantic salmon salmo salar |
publishDate |
2017 |
url |
http://hdl.handle.net/11250/2477897 https://doi.org/10.3354/aei00219 |
genre |
Atlantic salmon Salmo salar |
genre_facet |
Atlantic salmon Salmo salar |
op_source |
145-153 9 Aquaculture Environment Interactions 1 |
op_relation |
Aquaculture Environment Interactions. 2017, 9 (1), 145-153. urn:issn:1869-215X http://hdl.handle.net/11250/2477897 https://doi.org/10.3354/aei00219 cristin:1541932 |
op_doi |
https://doi.org/10.3354/aei00219 |
container_title |
Aquaculture Environment Interactions |
container_volume |
9 |
container_start_page |
145 |
op_container_end_page |
153 |
_version_ |
1766362169076613120 |