Surface environment modification in Atlantic salmon sea-cages: Effects on amoebic gill disease, salmon lice, growth and welfare
Surface environment modification is a potential parasite control strategy in Atlantic salmon sea-cage farming. For instance, a temporary low salinity surface layer in commercial-scale snorkel sea-cages has coincided with reduced amoebic gill disease (AGD) levels after an outbreak. We tested if a per...
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ftunivbergen:oai:bora.uib.no:1956/19435 2023-05-15T15:31:50+02:00 Surface environment modification in Atlantic salmon sea-cages: Effects on amoebic gill disease, salmon lice, growth and welfare Wright, Daniel William Geitung, Lena Karlsbakk, Egil Stien, Lars Helge Dempster, Timothy David Oldham, Tina Nola, Velimir Oppedal, Frode 2018-09-12T11:27:08Z application/pdf http://hdl.handle.net/1956/19435 https://doi.org/10.3354/aei00269 eng eng Inter-Research Norges forskningsråd: 267800 Norges forskningsråd: 256318 urn:issn:1869-215X urn:issn:1869-7534 http://hdl.handle.net/1956/19435 https://doi.org/10.3354/aei00269 cristin:1605281 Aquaculture Environment Interactions. 2018, 10, 255-265. Attribution CC BY http://creativecommons.org/licenses/by/4.0 Copyright 2018 The Author(s) Aquaculture Environment Interactions Aquaculture Cage environment Salmo Salar Lepeophtheirus salmonis Paramoeba perurans Parasite control Peer reviewed Journal article 2018 ftunivbergen https://doi.org/10.3354/aei00269 2023-03-14T17:40:28Z Surface environment modification is a potential parasite control strategy in Atlantic salmon sea-cage farming. For instance, a temporary low salinity surface layer in commercial-scale snorkel sea-cages has coincided with reduced amoebic gill disease (AGD) levels after an outbreak. We tested if a permanent freshwater (FW) surface layer in snorkel sea-cages would lower AGD and salmon lice levels of stock relative to snorkel cages with seawater (SW) only and standard production cages with no snorkels. Triplicate cages of each type with 2000 post-smolts were monitored in autumn to winter for 8 wk and sampled 4 times. Lower proportions of individuals with elevated AGD-related gill scores were registered in SW and FW snorkel cages compared to standard cages; however, these proportions did not differ between SW and FW snorkel cages. Individuals positive for AGD-causing Paramoeba perurans were reduced by 65% in FW snorkel relative to standard cages, but values were similar between SW snorkel cages and other types. While total lice burdens were reduced by 38% in SW snorkel compared to standard cages, they were unchanged between FW snorkel and other cage types. Fish welfare and growth were unaffected by cage type. Surface activity was detected in all cages; however, more surface jumps were recorded in standard than snorkel cages. Overall, fish in FW snorkel cages appeared to reside too little in freshwater to consistently reduce AGD levels and salmon lice compared to SW snorkel cages. Further work should test behavioural and environmental manipulations aimed at increasing freshwater or low salinity surface layer use. publishedVersion Article in Journal/Newspaper Atlantic salmon Salmo salar University of Bergen: Bergen Open Research Archive (BORA-UiB) Aquaculture Environment Interactions 10 255 265 |
institution |
Open Polar |
collection |
University of Bergen: Bergen Open Research Archive (BORA-UiB) |
op_collection_id |
ftunivbergen |
language |
English |
topic |
Aquaculture Cage environment Salmo Salar Lepeophtheirus salmonis Paramoeba perurans Parasite control |
spellingShingle |
Aquaculture Cage environment Salmo Salar Lepeophtheirus salmonis Paramoeba perurans Parasite control Wright, Daniel William Geitung, Lena Karlsbakk, Egil Stien, Lars Helge Dempster, Timothy David Oldham, Tina Nola, Velimir Oppedal, Frode Surface environment modification in Atlantic salmon sea-cages: Effects on amoebic gill disease, salmon lice, growth and welfare |
topic_facet |
Aquaculture Cage environment Salmo Salar Lepeophtheirus salmonis Paramoeba perurans Parasite control |
description |
Surface environment modification is a potential parasite control strategy in Atlantic salmon sea-cage farming. For instance, a temporary low salinity surface layer in commercial-scale snorkel sea-cages has coincided with reduced amoebic gill disease (AGD) levels after an outbreak. We tested if a permanent freshwater (FW) surface layer in snorkel sea-cages would lower AGD and salmon lice levels of stock relative to snorkel cages with seawater (SW) only and standard production cages with no snorkels. Triplicate cages of each type with 2000 post-smolts were monitored in autumn to winter for 8 wk and sampled 4 times. Lower proportions of individuals with elevated AGD-related gill scores were registered in SW and FW snorkel cages compared to standard cages; however, these proportions did not differ between SW and FW snorkel cages. Individuals positive for AGD-causing Paramoeba perurans were reduced by 65% in FW snorkel relative to standard cages, but values were similar between SW snorkel cages and other types. While total lice burdens were reduced by 38% in SW snorkel compared to standard cages, they were unchanged between FW snorkel and other cage types. Fish welfare and growth were unaffected by cage type. Surface activity was detected in all cages; however, more surface jumps were recorded in standard than snorkel cages. Overall, fish in FW snorkel cages appeared to reside too little in freshwater to consistently reduce AGD levels and salmon lice compared to SW snorkel cages. Further work should test behavioural and environmental manipulations aimed at increasing freshwater or low salinity surface layer use. publishedVersion |
format |
Article in Journal/Newspaper |
author |
Wright, Daniel William Geitung, Lena Karlsbakk, Egil Stien, Lars Helge Dempster, Timothy David Oldham, Tina Nola, Velimir Oppedal, Frode |
author_facet |
Wright, Daniel William Geitung, Lena Karlsbakk, Egil Stien, Lars Helge Dempster, Timothy David Oldham, Tina Nola, Velimir Oppedal, Frode |
author_sort |
Wright, Daniel William |
title |
Surface environment modification in Atlantic salmon sea-cages: Effects on amoebic gill disease, salmon lice, growth and welfare |
title_short |
Surface environment modification in Atlantic salmon sea-cages: Effects on amoebic gill disease, salmon lice, growth and welfare |
title_full |
Surface environment modification in Atlantic salmon sea-cages: Effects on amoebic gill disease, salmon lice, growth and welfare |
title_fullStr |
Surface environment modification in Atlantic salmon sea-cages: Effects on amoebic gill disease, salmon lice, growth and welfare |
title_full_unstemmed |
Surface environment modification in Atlantic salmon sea-cages: Effects on amoebic gill disease, salmon lice, growth and welfare |
title_sort |
surface environment modification in atlantic salmon sea-cages: effects on amoebic gill disease, salmon lice, growth and welfare |
publisher |
Inter-Research |
publishDate |
2018 |
url |
http://hdl.handle.net/1956/19435 https://doi.org/10.3354/aei00269 |
genre |
Atlantic salmon Salmo salar |
genre_facet |
Atlantic salmon Salmo salar |
op_source |
Aquaculture Environment Interactions |
op_relation |
Norges forskningsråd: 267800 Norges forskningsråd: 256318 urn:issn:1869-215X urn:issn:1869-7534 http://hdl.handle.net/1956/19435 https://doi.org/10.3354/aei00269 cristin:1605281 Aquaculture Environment Interactions. 2018, 10, 255-265. |
op_rights |
Attribution CC BY http://creativecommons.org/licenses/by/4.0 Copyright 2018 The Author(s) |
op_doi |
https://doi.org/10.3354/aei00269 |
container_title |
Aquaculture Environment Interactions |
container_volume |
10 |
container_start_page |
255 |
op_container_end_page |
265 |
_version_ |
1766362354832900096 |