Dynamics of dissolved oxygen inside salmon seacages with lice shielding skirts at two hydrographically different sites
Shielding skirts are widely used as a non-invasive preventive measure against salmon lice Lepeophtheirus salmonis infestations on Atlantic salmon Salmo salar in sea-cages. Low levels of dissolved oxygen (DO) are reported from some sites, but not others. This disparity is usually explained by local v...
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ftdoajarticles:oai:doaj.org/article:a893ed9c57424742b10eac9cd1784ca2 2023-05-15T15:32:39+02:00 Dynamics of dissolved oxygen inside salmon seacages with lice shielding skirts at two hydrographically different sites KE Jónsdóttir Z Volent JA Alfredsen 2020-12-01T00:00:00Z https://doi.org/10.3354/aei00384 https://doaj.org/article/a893ed9c57424742b10eac9cd1784ca2 EN eng Inter-Research https://www.int-res.com/abstracts/aei/v12/p559-570/ https://doaj.org/toc/1869-215X https://doaj.org/toc/1869-7534 1869-215X 1869-7534 doi:10.3354/aei00384 https://doaj.org/article/a893ed9c57424742b10eac9cd1784ca2 Aquaculture Environment Interactions, Vol 12, Pp 559-570 (2020) Aquaculture. Fisheries. Angling SH1-691 Ecology QH540-549.5 article 2020 ftdoajarticles https://doi.org/10.3354/aei00384 2022-12-31T11:50:44Z Shielding skirts are widely used as a non-invasive preventive measure against salmon lice Lepeophtheirus salmonis infestations on Atlantic salmon Salmo salar in sea-cages. Low levels of dissolved oxygen (DO) are reported from some sites, but not others. This disparity is usually explained by local variations in current flow and hydrography. The aim of the present study was to investigate these local variations through vertical mapping of DO and hydrography at 2 hydrographically different sites equipped with shielding skirts. The 2 sites chosen, Fornes and Soløya, are in northern Norway and are equipped with a permeable and a non-permeable skirt, respectively. Over a period of 3 d, current speed and direction were recorded outside the cage, while DO and hydrography were measured both inside and outside the cage, above and below the skirt. At Fornes, the DO inside the cage varied throughout the study period, while DO outside remained stable. The variation in DO inside the cage co-occurred with variations in strength and depth of a present pycnocline that broke down during the study period. At Soløya, DO levels were high throughout the study, and there was no gradient in salinity, temperature or density, indicating good vertical mixing. These data illustrate how the interaction between skirts and local conditions can influence the temporal and spatial variations of DO inside shielded cages and highlight the importance of studying local current conditions and hydrography when applying shielding skirts. Article in Journal/Newspaper Atlantic salmon Northern Norway Salmo salar Directory of Open Access Journals: DOAJ Articles Norway Soløya ENVELOPE(8.864,8.864,63.436,63.436) Aquaculture Environment Interactions 12 559 570 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Aquaculture. Fisheries. Angling SH1-691 Ecology QH540-549.5 |
spellingShingle |
Aquaculture. Fisheries. Angling SH1-691 Ecology QH540-549.5 KE Jónsdóttir Z Volent JA Alfredsen Dynamics of dissolved oxygen inside salmon seacages with lice shielding skirts at two hydrographically different sites |
topic_facet |
Aquaculture. Fisheries. Angling SH1-691 Ecology QH540-549.5 |
description |
Shielding skirts are widely used as a non-invasive preventive measure against salmon lice Lepeophtheirus salmonis infestations on Atlantic salmon Salmo salar in sea-cages. Low levels of dissolved oxygen (DO) are reported from some sites, but not others. This disparity is usually explained by local variations in current flow and hydrography. The aim of the present study was to investigate these local variations through vertical mapping of DO and hydrography at 2 hydrographically different sites equipped with shielding skirts. The 2 sites chosen, Fornes and Soløya, are in northern Norway and are equipped with a permeable and a non-permeable skirt, respectively. Over a period of 3 d, current speed and direction were recorded outside the cage, while DO and hydrography were measured both inside and outside the cage, above and below the skirt. At Fornes, the DO inside the cage varied throughout the study period, while DO outside remained stable. The variation in DO inside the cage co-occurred with variations in strength and depth of a present pycnocline that broke down during the study period. At Soløya, DO levels were high throughout the study, and there was no gradient in salinity, temperature or density, indicating good vertical mixing. These data illustrate how the interaction between skirts and local conditions can influence the temporal and spatial variations of DO inside shielded cages and highlight the importance of studying local current conditions and hydrography when applying shielding skirts. |
format |
Article in Journal/Newspaper |
author |
KE Jónsdóttir Z Volent JA Alfredsen |
author_facet |
KE Jónsdóttir Z Volent JA Alfredsen |
author_sort |
KE Jónsdóttir |
title |
Dynamics of dissolved oxygen inside salmon seacages with lice shielding skirts at two hydrographically different sites |
title_short |
Dynamics of dissolved oxygen inside salmon seacages with lice shielding skirts at two hydrographically different sites |
title_full |
Dynamics of dissolved oxygen inside salmon seacages with lice shielding skirts at two hydrographically different sites |
title_fullStr |
Dynamics of dissolved oxygen inside salmon seacages with lice shielding skirts at two hydrographically different sites |
title_full_unstemmed |
Dynamics of dissolved oxygen inside salmon seacages with lice shielding skirts at two hydrographically different sites |
title_sort |
dynamics of dissolved oxygen inside salmon seacages with lice shielding skirts at two hydrographically different sites |
publisher |
Inter-Research |
publishDate |
2020 |
url |
https://doi.org/10.3354/aei00384 https://doaj.org/article/a893ed9c57424742b10eac9cd1784ca2 |
long_lat |
ENVELOPE(8.864,8.864,63.436,63.436) |
geographic |
Norway Soløya |
geographic_facet |
Norway Soløya |
genre |
Atlantic salmon Northern Norway Salmo salar |
genre_facet |
Atlantic salmon Northern Norway Salmo salar |
op_source |
Aquaculture Environment Interactions, Vol 12, Pp 559-570 (2020) |
op_relation |
https://www.int-res.com/abstracts/aei/v12/p559-570/ https://doaj.org/toc/1869-215X https://doaj.org/toc/1869-7534 1869-215X 1869-7534 doi:10.3354/aei00384 https://doaj.org/article/a893ed9c57424742b10eac9cd1784ca2 |
op_doi |
https://doi.org/10.3354/aei00384 |
container_title |
Aquaculture Environment Interactions |
container_volume |
12 |
container_start_page |
559 |
op_container_end_page |
570 |
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1766363141508169728 |