Use of fatty acid profiles to monitor the escape history of farmed Atlantic salmon

Farmed Atlantic salmon can escape from fish farms at various stages of their life, from juveniles to large mature fish. Escapees that enter rivers to spawn pose a threat to the genetic integrity of wild populations. Knowledge about the timing of these escapes can provide important information for wi...

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Autores principales:	OT Skilbrei, E Normann, S Meier, RE Olsen
Formato:	article
Lenguaje:	EN
Publicado:	Inter-Research 2015
Materias:	Aquaculture. Fisheries. Angling SH1-691 Ecology QH540-549.5
Acceso en línea:	https://doaj.org/article/a31e417f1c424ba7a486cdaea54c5a67
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spelling	oai:doaj.org-article:a31e417f1c424ba7a486cdaea54c5a672021-11-16T09:40:27ZUse of fatty acid profiles to monitor the escape history of farmed Atlantic salmon1869-215X1869-753410.3354/aei00132https://doaj.org/article/a31e417f1c424ba7a486cdaea54c5a672015-05-01T00:00:00Zhttps://www.int-res.com/abstracts/aei/v7/n1/p1-13/https://doaj.org/toc/1869-215Xhttps://doaj.org/toc/1869-7534Farmed Atlantic salmon can escape from fish farms at various stages of their life, from juveniles to large mature fish. Escapees that enter rivers to spawn pose a threat to the genetic integrity of wild populations. Knowledge about the timing of these escapes can provide important information for wildlife management and the aquaculture industry, enabling them to prevent or mitigate the negative impacts of escapees. Farmed salmon food has a high content of terrestrial lipids; thus, we used fatty acid (FA) profiling to monitor the escape history of farmed salmon. Escaped salmon captured in rivers (n = 251) presented a wide range of FA profiles that we used to classify the fish as (1) early-escaped wild-like fish that were assumed to have escaped at smolt or early post-smolt stage (24%), (2) recently escaped fish with high levels of FAs typically found in commercial salmon food (61%) and (3) intermediate escapees whose FA profiles lay between those 2 groups (15%). To estimate the size at escape of the intermediate escapees, we performed a feeding experiment that monitored the development of FA profiles after a shift in diet from terrestrial to marine lipids. Most intermediate escapees appeared to have escaped when they were <3 kg, and ranged from 3 to 11 kg when recaptured in rivers. We conclude that FA profiling is a promising tool to monitor escape histories, and that the proportion of post-smolt escapees in this study was high compared to official escape statistics which include very few reports of young fish escaping.OT SkilbreiE NormannS MeierRE OlsenInter-ResearcharticleAquaculture. Fisheries. AnglingSH1-691EcologyQH540-549.5ENAquaculture Environment Interactions, Vol 7, Iss 1, Pp 1-13 (2015)
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 OT Skilbrei E Normann S Meier RE Olsen Use of fatty acid profiles to monitor the escape history of farmed Atlantic salmon
description	Farmed Atlantic salmon can escape from fish farms at various stages of their life, from juveniles to large mature fish. Escapees that enter rivers to spawn pose a threat to the genetic integrity of wild populations. Knowledge about the timing of these escapes can provide important information for wildlife management and the aquaculture industry, enabling them to prevent or mitigate the negative impacts of escapees. Farmed salmon food has a high content of terrestrial lipids; thus, we used fatty acid (FA) profiling to monitor the escape history of farmed salmon. Escaped salmon captured in rivers (n = 251) presented a wide range of FA profiles that we used to classify the fish as (1) early-escaped wild-like fish that were assumed to have escaped at smolt or early post-smolt stage (24%), (2) recently escaped fish with high levels of FAs typically found in commercial salmon food (61%) and (3) intermediate escapees whose FA profiles lay between those 2 groups (15%). To estimate the size at escape of the intermediate escapees, we performed a feeding experiment that monitored the development of FA profiles after a shift in diet from terrestrial to marine lipids. Most intermediate escapees appeared to have escaped when they were <3 kg, and ranged from 3 to 11 kg when recaptured in rivers. We conclude that FA profiling is a promising tool to monitor escape histories, and that the proportion of post-smolt escapees in this study was high compared to official escape statistics which include very few reports of young fish escaping.
format	article
author	OT Skilbrei E Normann S Meier RE Olsen
author_facet	OT Skilbrei E Normann S Meier RE Olsen
author_sort	OT Skilbrei
title	Use of fatty acid profiles to monitor the escape history of farmed Atlantic salmon
title_short	Use of fatty acid profiles to monitor the escape history of farmed Atlantic salmon
title_full	Use of fatty acid profiles to monitor the escape history of farmed Atlantic salmon
title_fullStr	Use of fatty acid profiles to monitor the escape history of farmed Atlantic salmon
title_full_unstemmed	Use of fatty acid profiles to monitor the escape history of farmed Atlantic salmon
title_sort	use of fatty acid profiles to monitor the escape history of farmed atlantic salmon
publisher	Inter-Research
publishDate	2015
url	https://doaj.org/article/a31e417f1c424ba7a486cdaea54c5a67
work_keys_str_mv	AT otskilbrei useoffattyacidprofilestomonitortheescapehistoryoffarmedatlanticsalmon AT enormann useoffattyacidprofilestomonitortheescapehistoryoffarmedatlanticsalmon AT smeier useoffattyacidprofilestomonitortheescapehistoryoffarmedatlanticsalmon AT reolsen useoffattyacidprofilestomonitortheescapehistoryoffarmedatlanticsalmon
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Use of fatty acid profiles to monitor the escape history of farmed Atlantic salmon

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