Sea lice infestation level alters salmon swimming depth in sea-cages

Host-parasite systems are often characterised by a co-evolutionary arms race, with avoidance behaviour being the first line of defence for hosts. In aquatic ecosystems, the rapid rise of fish farming has elevated host abundance, altering the context of host-parasite interactions. Behavioural defence...

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Autores principales:	S Bui, F Oppedal, L Stien, T Dempster
Formato:	article
Lenguaje:	EN
Publicado:	Inter-Research 2016
Materias:	Aquaculture. Fisheries. Angling SH1-691 Ecology QH540-549.5
Acceso en línea:	https://doaj.org/article/fbe63b9bc0ae4955a12c254a1fd913c8
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spelling	oai:doaj.org-article:fbe63b9bc0ae4955a12c254a1fd913c82021-11-11T11:05:28ZSea lice infestation level alters salmon swimming depth in sea-cages1869-215X1869-753410.3354/aei00188https://doaj.org/article/fbe63b9bc0ae4955a12c254a1fd913c82016-08-01T00:00:00Zhttps://www.int-res.com/abstracts/aei/v8/p429-435/https://doaj.org/toc/1869-215Xhttps://doaj.org/toc/1869-7534Host-parasite systems are often characterised by a co-evolutionary arms race, with avoidance behaviour being the first line of defence for hosts. In aquatic ecosystems, the rapid rise of fish farming has elevated host abundance, altering the context of host-parasite interactions. Behavioural defences in host fish may adapt to combat infection pressure in the captive environment. We tested whether farmed Atlantic salmon Salmo salar altered their swimming depth in response to the ectoparasitic sea louse Lepeophtheirus salmonis. Parasite loads were manipulated on individual fish, which were implanted with internal tags that recorded swimming depth. During daylight hours, salmon exhibited identical swimming depths irrespective of parasite load. However, fish with higher parasite loads (12-18 lice fish-1) swam deeper at nighttime, compared to fish with no or moderate parasite loads (0-6 lice fish-1). As infective sea louse copepodids are concentrated near the surface, our results suggest that the preference for deeper water in fish with higher parasite loads is an avoidance mechanism to prevent further infestation. Host behavioural responses to parasites are predicted to shift with changes to the system and artificial selection of host phenotypes; our study provides the first evidence of a parasite avoidance response in salmon held in sea-cages.S BuiF OppedalL StienT DempsterInter-ResearcharticleAquaculture. Fisheries. AnglingSH1-691EcologyQH540-549.5ENAquaculture Environment Interactions, Vol 8, Pp 429-435 (2016)
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 S Bui F Oppedal L Stien T Dempster Sea lice infestation level alters salmon swimming depth in sea-cages
description	Host-parasite systems are often characterised by a co-evolutionary arms race, with avoidance behaviour being the first line of defence for hosts. In aquatic ecosystems, the rapid rise of fish farming has elevated host abundance, altering the context of host-parasite interactions. Behavioural defences in host fish may adapt to combat infection pressure in the captive environment. We tested whether farmed Atlantic salmon Salmo salar altered their swimming depth in response to the ectoparasitic sea louse Lepeophtheirus salmonis. Parasite loads were manipulated on individual fish, which were implanted with internal tags that recorded swimming depth. During daylight hours, salmon exhibited identical swimming depths irrespective of parasite load. However, fish with higher parasite loads (12-18 lice fish-1) swam deeper at nighttime, compared to fish with no or moderate parasite loads (0-6 lice fish-1). As infective sea louse copepodids are concentrated near the surface, our results suggest that the preference for deeper water in fish with higher parasite loads is an avoidance mechanism to prevent further infestation. Host behavioural responses to parasites are predicted to shift with changes to the system and artificial selection of host phenotypes; our study provides the first evidence of a parasite avoidance response in salmon held in sea-cages.
format	article
author	S Bui F Oppedal L Stien T Dempster
author_facet	S Bui F Oppedal L Stien T Dempster
author_sort	S Bui
title	Sea lice infestation level alters salmon swimming depth in sea-cages
title_short	Sea lice infestation level alters salmon swimming depth in sea-cages
title_full	Sea lice infestation level alters salmon swimming depth in sea-cages
title_fullStr	Sea lice infestation level alters salmon swimming depth in sea-cages
title_full_unstemmed	Sea lice infestation level alters salmon swimming depth in sea-cages
title_sort	sea lice infestation level alters salmon swimming depth in sea-cages
publisher	Inter-Research
publishDate	2016
url	https://doaj.org/article/fbe63b9bc0ae4955a12c254a1fd913c8
work_keys_str_mv	AT sbui sealiceinfestationlevelalterssalmonswimmingdepthinseacages AT foppedal sealiceinfestationlevelalterssalmonswimmingdepthinseacages AT lstien sealiceinfestationlevelalterssalmonswimmingdepthinseacages AT tdempster sealiceinfestationlevelalterssalmonswimmingdepthinseacages
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Sea lice infestation level alters salmon swimming depth in sea-cages

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