Effects of salmon lice infection on the behaviour of sea trout in the marine phase

Salmon lice Lepeophtheirus salmonis Krøyer may affect survival and growth of anadromous salmonids through physiological stress and/or behavioural changes. Using acoustic telemetry tracking, we investigated the behaviour of 30 infected sea trout Salmo trutta throughout the summer in a fjord with very...

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Autores principales:	KØ Gjelland, RM Serra-Llinares, RD Hedger, P Arechavala-Lopez, R Nilsen, B Finstad, I Uglem, OT Skilbrei, PA Bjørn
Formato:	article
Lenguaje:	EN
Publicado:	Inter-Research 2014
Materias:	Aquaculture. Fisheries. Angling SH1-691 Ecology QH540-549.5
Acceso en línea:	https://doaj.org/article/d33877991461408f843ccfb7527fb447
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spelling	oai:doaj.org-article:d33877991461408f843ccfb7527fb4472021-11-17T10:11:11ZEffects of salmon lice infection on the behaviour of sea trout in the marine phase1869-215X1869-753410.3354/aei00105https://doaj.org/article/d33877991461408f843ccfb7527fb4472014-07-01T00:00:00Zhttps://www.int-res.com/abstracts/aei/v5/n3/p221-233/https://doaj.org/toc/1869-215Xhttps://doaj.org/toc/1869-7534Salmon lice Lepeophtheirus salmonis Krøyer may affect survival and growth of anadromous salmonids through physiological stress and/or behavioural changes. Using acoustic telemetry tracking, we investigated the behaviour of 30 infected sea trout Salmo trutta throughout the summer in a fjord with very high salmon lice infection pressure. Most of the tracked sea trout adopted a movement pattern expected to suppress salmon lice infestation, as they showed a strong preference for fresh or brackish water, spending most of the time close to a river outlet or even migrating into the river. Highly infested sea trout preferred shallower depths, associated with lower salinity. The fish lost to predation stayed further away from the river outlet than non-predated fish, and were likely subjected to a stronger infection pressure. Half of the tracked group were treated with a salmon lice prophylaxis, emamectin benzoate. The effect of treatment on infestation was monitored in a separate group held in a sea cage and found to be moderate; the mortality in this group was associated with infestation by motile lice stages. In contrast, treatment was not found to have an effect on tracked fish behaviour. It is likely that some physiological and behavioural responses to high salmon lice infection pressure may be present even after a prophylaxis treatment, in particular when the treatment is given after exposure to salmon lice infection. We conclude that increased salmon lice infection pressure associated with altered salmon farming practice may have the potential to influence the marine behaviour and growth of sea trout.KØ GjellandRM Serra-LlinaresRD HedgerP Arechavala-LopezR NilsenB FinstadI UglemOT SkilbreiPA BjørnInter-ResearcharticleAquaculture. Fisheries. AnglingSH1-691EcologyQH540-549.5ENAquaculture Environment Interactions, Vol 5, Iss 3, Pp 221-233 (2014)
institution	DOAJ
collection	DOAJ
language	EN
topic	Aquaculture. Fisheries. Angling SH1-691 Ecology QH540-549.5
spellingShingle	Aquaculture. Fisheries. Angling SH1-691 Ecology QH540-549.5 KØ Gjelland RM Serra-Llinares RD Hedger P Arechavala-Lopez R Nilsen B Finstad I Uglem OT Skilbrei PA Bjørn Effects of salmon lice infection on the behaviour of sea trout in the marine phase
description	Salmon lice Lepeophtheirus salmonis Krøyer may affect survival and growth of anadromous salmonids through physiological stress and/or behavioural changes. Using acoustic telemetry tracking, we investigated the behaviour of 30 infected sea trout Salmo trutta throughout the summer in a fjord with very high salmon lice infection pressure. Most of the tracked sea trout adopted a movement pattern expected to suppress salmon lice infestation, as they showed a strong preference for fresh or brackish water, spending most of the time close to a river outlet or even migrating into the river. Highly infested sea trout preferred shallower depths, associated with lower salinity. The fish lost to predation stayed further away from the river outlet than non-predated fish, and were likely subjected to a stronger infection pressure. Half of the tracked group were treated with a salmon lice prophylaxis, emamectin benzoate. The effect of treatment on infestation was monitored in a separate group held in a sea cage and found to be moderate; the mortality in this group was associated with infestation by motile lice stages. In contrast, treatment was not found to have an effect on tracked fish behaviour. It is likely that some physiological and behavioural responses to high salmon lice infection pressure may be present even after a prophylaxis treatment, in particular when the treatment is given after exposure to salmon lice infection. We conclude that increased salmon lice infection pressure associated with altered salmon farming practice may have the potential to influence the marine behaviour and growth of sea trout.
format	article
author	KØ Gjelland RM Serra-Llinares RD Hedger P Arechavala-Lopez R Nilsen B Finstad I Uglem OT Skilbrei PA Bjørn
author_facet	KØ Gjelland RM Serra-Llinares RD Hedger P Arechavala-Lopez R Nilsen B Finstad I Uglem OT Skilbrei PA Bjørn
author_sort	KØ Gjelland
title	Effects of salmon lice infection on the behaviour of sea trout in the marine phase
title_short	Effects of salmon lice infection on the behaviour of sea trout in the marine phase
title_full	Effects of salmon lice infection on the behaviour of sea trout in the marine phase
title_fullStr	Effects of salmon lice infection on the behaviour of sea trout in the marine phase
title_full_unstemmed	Effects of salmon lice infection on the behaviour of sea trout in the marine phase
title_sort	effects of salmon lice infection on the behaviour of sea trout in the marine phase
publisher	Inter-Research
publishDate	2014
url	https://doaj.org/article/d33877991461408f843ccfb7527fb447
work_keys_str_mv	AT køgjelland effectsofsalmonliceinfectiononthebehaviourofseatroutinthemarinephase AT rmserrallinares effectsofsalmonliceinfectiononthebehaviourofseatroutinthemarinephase AT rdhedger effectsofsalmonliceinfectiononthebehaviourofseatroutinthemarinephase AT parechavalalopez effectsofsalmonliceinfectiononthebehaviourofseatroutinthemarinephase AT rnilsen effectsofsalmonliceinfectiononthebehaviourofseatroutinthemarinephase AT bfinstad effectsofsalmonliceinfectiononthebehaviourofseatroutinthemarinephase AT iuglem effectsofsalmonliceinfectiononthebehaviourofseatroutinthemarinephase AT otskilbrei effectsofsalmonliceinfectiononthebehaviourofseatroutinthemarinephase AT pabjørn effectsofsalmonliceinfectiononthebehaviourofseatroutinthemarinephase
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Effects of salmon lice infection on the behaviour of sea trout in the marine phase

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