Tracking escaped Atlantic cod (Gadus morhua L.) aggregated around Norwegian farms: Considerations for management strategies

To examine site fidelity and potential for ecosystem impacts, 20 escapee cod (Gadus morhua L.) from fjord-based cod farms were tagged with acoustic transmitters, released in the vicinity of the same farm, and their subsequent behaviour and survival monitored using a fixed array of acoustic receivers...

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Published in:Fisheries Management and Ecology
Main Authors: Hedger, Richard David, Serra-Llinares, Rosa Maria, Arechavala-Lopez, Pablo, Nilsen, Rune, Bjørn, Pal-Arne, Uglem, Ingebrigt
Other Authors: Universidad de Alicante. Departamento de Ciencias del Mar y Biología Aplicada, Biología Marina
Format: Article in Journal/Newspaper
Language:English
Published: John Wiley & Sons 2017
Subjects:
Online Access:http://hdl.handle.net/10045/69010
https://doi.org/10.1111/fme.12219
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record_format openpolar
spelling ftunivalicante:oai:rua.ua.es:10045/69010 2023-05-15T15:27:34+02:00 Tracking escaped Atlantic cod (Gadus morhua L.) aggregated around Norwegian farms: Considerations for management strategies Hedger, Richard David Serra-Llinares, Rosa Maria Arechavala-Lopez, Pablo Nilsen, Rune Bjørn, Pal-Arne Uglem, Ingebrigt Universidad de Alicante. Departamento de Ciencias del Mar y Biología Aplicada Biología Marina 2017-08 http://hdl.handle.net/10045/69010 https://doi.org/10.1111/fme.12219 eng eng John Wiley & Sons http://dx.doi.org/10.1111/fme.12219 info:eu-repo/grantAgreement/EC/FP7/226885 Fisheries Management and Ecology. 2017, 24(4): 265-273. doi:10.1111/fme.12219 0969-997X (Print) 1365-2400 (Online) http://hdl.handle.net/10045/69010 doi:10.1111/fme.12219 © 2017 John Wiley & Sons Ltd info:eu-repo/semantics/restrictedAccess Aquaculture Behaviour Escapees Mortality Site fidelity Telemetry Zoología info:eu-repo/semantics/article 2017 ftunivalicante https://doi.org/10.1111/fme.12219 2020-06-05T13:18:15Z To examine site fidelity and potential for ecosystem impacts, 20 escapee cod (Gadus morhua L.) from fjord-based cod farms were tagged with acoustic transmitters, released in the vicinity of the same farm, and their subsequent behaviour and survival monitored using a fixed array of acoustic receivers. Most individuals demonstrated high fidelity to their farm where tagged, and this increased during the polar night. Only five individuals (25%) were occasionally detected at another farm (4 km distance), and only three cod (15%) migrated out of the fjord during the 6-month study period. Vertical movements were consistently greater in the hours around noon than at night, a behaviour inconsistent with that observed for wild fish. A high mortality rate (40%) was observed during the first 4 months post-release, and actual mortality may have been even higher, limiting the potential for negative ecosystem effects from cod escapees. Findings from this study are used to discuss the development of recapture strategies for minimising potential impacts from cod escapees to ensure sustainable farming activity. European Union’s 7th Research Framework Prevent Escape, Grant/Award Number: 226885. Article in Journal/Newspaper atlantic cod Gadus morhua polar night RUA - Repositorio Institucional de la Universidad de Alicante Fisheries Management and Ecology 24 4 265 273
institution Open Polar
collection RUA - Repositorio Institucional de la Universidad de Alicante
op_collection_id ftunivalicante
language English
topic Aquaculture
Behaviour
Escapees
Mortality
Site fidelity
Telemetry
Zoología
spellingShingle Aquaculture
Behaviour
Escapees
Mortality
Site fidelity
Telemetry
Zoología
Hedger, Richard David
Serra-Llinares, Rosa Maria
Arechavala-Lopez, Pablo
Nilsen, Rune
Bjørn, Pal-Arne
Uglem, Ingebrigt
Tracking escaped Atlantic cod (Gadus morhua L.) aggregated around Norwegian farms: Considerations for management strategies
topic_facet Aquaculture
Behaviour
Escapees
Mortality
Site fidelity
Telemetry
Zoología
description To examine site fidelity and potential for ecosystem impacts, 20 escapee cod (Gadus morhua L.) from fjord-based cod farms were tagged with acoustic transmitters, released in the vicinity of the same farm, and their subsequent behaviour and survival monitored using a fixed array of acoustic receivers. Most individuals demonstrated high fidelity to their farm where tagged, and this increased during the polar night. Only five individuals (25%) were occasionally detected at another farm (4 km distance), and only three cod (15%) migrated out of the fjord during the 6-month study period. Vertical movements were consistently greater in the hours around noon than at night, a behaviour inconsistent with that observed for wild fish. A high mortality rate (40%) was observed during the first 4 months post-release, and actual mortality may have been even higher, limiting the potential for negative ecosystem effects from cod escapees. Findings from this study are used to discuss the development of recapture strategies for minimising potential impacts from cod escapees to ensure sustainable farming activity. European Union’s 7th Research Framework Prevent Escape, Grant/Award Number: 226885.
author2 Universidad de Alicante. Departamento de Ciencias del Mar y Biología Aplicada
Biología Marina
format Article in Journal/Newspaper
author Hedger, Richard David
Serra-Llinares, Rosa Maria
Arechavala-Lopez, Pablo
Nilsen, Rune
Bjørn, Pal-Arne
Uglem, Ingebrigt
author_facet Hedger, Richard David
Serra-Llinares, Rosa Maria
Arechavala-Lopez, Pablo
Nilsen, Rune
Bjørn, Pal-Arne
Uglem, Ingebrigt
author_sort Hedger, Richard David
title Tracking escaped Atlantic cod (Gadus morhua L.) aggregated around Norwegian farms: Considerations for management strategies
title_short Tracking escaped Atlantic cod (Gadus morhua L.) aggregated around Norwegian farms: Considerations for management strategies
title_full Tracking escaped Atlantic cod (Gadus morhua L.) aggregated around Norwegian farms: Considerations for management strategies
title_fullStr Tracking escaped Atlantic cod (Gadus morhua L.) aggregated around Norwegian farms: Considerations for management strategies
title_full_unstemmed Tracking escaped Atlantic cod (Gadus morhua L.) aggregated around Norwegian farms: Considerations for management strategies
title_sort tracking escaped atlantic cod (gadus morhua l.) aggregated around norwegian farms: considerations for management strategies
publisher John Wiley & Sons
publishDate 2017
url http://hdl.handle.net/10045/69010
https://doi.org/10.1111/fme.12219
genre atlantic cod
Gadus morhua
polar night
genre_facet atlantic cod
Gadus morhua
polar night
op_relation http://dx.doi.org/10.1111/fme.12219
info:eu-repo/grantAgreement/EC/FP7/226885
Fisheries Management and Ecology. 2017, 24(4): 265-273. doi:10.1111/fme.12219
0969-997X (Print)
1365-2400 (Online)
http://hdl.handle.net/10045/69010
doi:10.1111/fme.12219
op_rights © 2017 John Wiley & Sons Ltd
info:eu-repo/semantics/restrictedAccess
op_doi https://doi.org/10.1111/fme.12219
container_title Fisheries Management and Ecology
container_volume 24
container_issue 4
container_start_page 265
op_container_end_page 273
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