Migration of Atlantic salmon post-smolts in a fjord with high infestation pressure of salmon lice
Understanding Atlantic salmon Salmo salar post-smolt coastal migration behaviour is crucial for predicting their exposure to ecological challenges such as the parasite salmon louse Lepeophtheirus salmonis. We compared the migration of acoustically tagged, hatchery-reared Atlantic salmon post-smolts...
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Online Access: | http://hdl.handle.net/11250/2506129 https://doi.org/10.3354/meps12403 |
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ftimr:oai:imr.brage.unit.no:11250/2506129 2023-05-15T15:31:02+02:00 Migration of Atlantic salmon post-smolts in a fjord with high infestation pressure of salmon lice Halttunen, Elina Gjelland, Karl Øystein Glover, Kevin Johnsen, Ingrid Askeland Serra-Llinares, Rosa-Maria Skaala, Øystein Nilsen, Rune Bjørn, Pål Arne Karlsen, Ørjan Finstad, Bengt Skilbrei, Ove Tommy 2018 application/pdf http://hdl.handle.net/11250/2506129 https://doi.org/10.3354/meps12403 eng eng Norges forskningsråd: 221404 Marine Ecology Progress Series. 2018, 592 243-256. urn:issn:0171-8630 http://hdl.handle.net/11250/2506129 https://doi.org/10.3354/meps12403 cristin:1577524 243-256 592 Marine Ecology Progress Series VDP::Zoologiske og botaniske fag: 480 VDP::Zoology and botany: 480 Peer reviewed Journal article 2018 ftimr https://doi.org/10.3354/meps12403 2021-09-23T20:14:34Z Understanding Atlantic salmon Salmo salar post-smolt coastal migration behaviour is crucial for predicting their exposure to ecological challenges such as the parasite salmon louse Lepeophtheirus salmonis. We compared the migration of acoustically tagged, hatchery-reared Atlantic salmon post-smolts of wild and domesticated origins from the inner, middle and outer part of a 172 km long aquaculture-intensive fjord in western Norway. Additionally, we examined if the timing of the release or treatment with an anti-parasitic drug (prophylaxis) altered migratory behaviour. We found no significant differences in mean progression rates among the 3 release locations, among genetic groups or between treatments (range: 11.5−16.9 km d−1). However, individual variation in progression rates and migratory routes resulted in large differences in fjord residence times (range: 2−39 d). Ocean-current directions during and after release affected swimming speed, progression rate and route choice, and for most post-smolts, swimming speeds were much higher than their progression rates out of the fjord. The predicted lice loads based on lice intensity growth rates on smolts held in sentinel cages throughout the fjord indicated that individuals taking >10 d to exit the fjord in periods with high infestation pressure are likely to get lethally high sea-lice infestations. We conclude that, as migratory routes of S. salar post-smolts are hard to predict and migration times can stretch up to over a month, it is important to develop aquaculture management that keeps salmon lice levels down along all potential migration routes and during the full potential migratory period. Migratory behaviour · Salmo salar · Lepeophtheirus salmonis · Acoustic telemetry · Management · Fish farming · Parasite publishedVersion Article in Journal/Newspaper Atlantic salmon Salmo salar Institute for Marine Research: Brage IMR Norway Marine Ecology Progress Series 592 243 256 |
institution |
Open Polar |
collection |
Institute for Marine Research: Brage IMR |
op_collection_id |
ftimr |
language |
English |
topic |
VDP::Zoologiske og botaniske fag: 480 VDP::Zoology and botany: 480 |
spellingShingle |
VDP::Zoologiske og botaniske fag: 480 VDP::Zoology and botany: 480 Halttunen, Elina Gjelland, Karl Øystein Glover, Kevin Johnsen, Ingrid Askeland Serra-Llinares, Rosa-Maria Skaala, Øystein Nilsen, Rune Bjørn, Pål Arne Karlsen, Ørjan Finstad, Bengt Skilbrei, Ove Tommy Migration of Atlantic salmon post-smolts in a fjord with high infestation pressure of salmon lice |
topic_facet |
VDP::Zoologiske og botaniske fag: 480 VDP::Zoology and botany: 480 |
description |
Understanding Atlantic salmon Salmo salar post-smolt coastal migration behaviour is crucial for predicting their exposure to ecological challenges such as the parasite salmon louse Lepeophtheirus salmonis. We compared the migration of acoustically tagged, hatchery-reared Atlantic salmon post-smolts of wild and domesticated origins from the inner, middle and outer part of a 172 km long aquaculture-intensive fjord in western Norway. Additionally, we examined if the timing of the release or treatment with an anti-parasitic drug (prophylaxis) altered migratory behaviour. We found no significant differences in mean progression rates among the 3 release locations, among genetic groups or between treatments (range: 11.5−16.9 km d−1). However, individual variation in progression rates and migratory routes resulted in large differences in fjord residence times (range: 2−39 d). Ocean-current directions during and after release affected swimming speed, progression rate and route choice, and for most post-smolts, swimming speeds were much higher than their progression rates out of the fjord. The predicted lice loads based on lice intensity growth rates on smolts held in sentinel cages throughout the fjord indicated that individuals taking >10 d to exit the fjord in periods with high infestation pressure are likely to get lethally high sea-lice infestations. We conclude that, as migratory routes of S. salar post-smolts are hard to predict and migration times can stretch up to over a month, it is important to develop aquaculture management that keeps salmon lice levels down along all potential migration routes and during the full potential migratory period. Migratory behaviour · Salmo salar · Lepeophtheirus salmonis · Acoustic telemetry · Management · Fish farming · Parasite publishedVersion |
format |
Article in Journal/Newspaper |
author |
Halttunen, Elina Gjelland, Karl Øystein Glover, Kevin Johnsen, Ingrid Askeland Serra-Llinares, Rosa-Maria Skaala, Øystein Nilsen, Rune Bjørn, Pål Arne Karlsen, Ørjan Finstad, Bengt Skilbrei, Ove Tommy |
author_facet |
Halttunen, Elina Gjelland, Karl Øystein Glover, Kevin Johnsen, Ingrid Askeland Serra-Llinares, Rosa-Maria Skaala, Øystein Nilsen, Rune Bjørn, Pål Arne Karlsen, Ørjan Finstad, Bengt Skilbrei, Ove Tommy |
author_sort |
Halttunen, Elina |
title |
Migration of Atlantic salmon post-smolts in a fjord with high infestation pressure of salmon lice |
title_short |
Migration of Atlantic salmon post-smolts in a fjord with high infestation pressure of salmon lice |
title_full |
Migration of Atlantic salmon post-smolts in a fjord with high infestation pressure of salmon lice |
title_fullStr |
Migration of Atlantic salmon post-smolts in a fjord with high infestation pressure of salmon lice |
title_full_unstemmed |
Migration of Atlantic salmon post-smolts in a fjord with high infestation pressure of salmon lice |
title_sort |
migration of atlantic salmon post-smolts in a fjord with high infestation pressure of salmon lice |
publishDate |
2018 |
url |
http://hdl.handle.net/11250/2506129 https://doi.org/10.3354/meps12403 |
geographic |
Norway |
geographic_facet |
Norway |
genre |
Atlantic salmon Salmo salar |
genre_facet |
Atlantic salmon Salmo salar |
op_source |
243-256 592 Marine Ecology Progress Series |
op_relation |
Norges forskningsråd: 221404 Marine Ecology Progress Series. 2018, 592 243-256. urn:issn:0171-8630 http://hdl.handle.net/11250/2506129 https://doi.org/10.3354/meps12403 cristin:1577524 |
op_doi |
https://doi.org/10.3354/meps12403 |
container_title |
Marine Ecology Progress Series |
container_volume |
592 |
container_start_page |
243 |
op_container_end_page |
256 |
_version_ |
1766361526941253632 |