Reproductive interactions between fugitive farmed and wild Atlantic cod ( Gadus morhua) in the field
Atlantic cod ( Gadus morhua ) are being increasingly farmed in net pens adjacent to coastal populations that are currently at historic lows. One concern is that farmed escapees enter local spawning shoals and mate with wild cod. We tested for the potential of escaped farmed cod to interact and hybri...
Published in: | Canadian Journal of Fisheries and Aquatic Sciences |
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Online Access: | http://dx.doi.org/10.1139/f10-066 http://www.nrcresearchpress.com/doi/full-xml/10.1139/F10-066 http://www.nrcresearchpress.com/doi/pdf/10.1139/F10-066 |
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crcansciencepubl:10.1139/f10-066 2024-05-19T07:37:06+00:00 Reproductive interactions between fugitive farmed and wild Atlantic cod ( Gadus morhua) in the field Meager, Justin J. Skjæraasen, Jon Egil Fernö, Anders Løkkeborg, Svein Marshall, C. Tara 2010 http://dx.doi.org/10.1139/f10-066 http://www.nrcresearchpress.com/doi/full-xml/10.1139/F10-066 http://www.nrcresearchpress.com/doi/pdf/10.1139/F10-066 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Fisheries and Aquatic Sciences volume 67, issue 8, page 1221-1231 ISSN 0706-652X 1205-7533 journal-article 2010 crcansciencepubl https://doi.org/10.1139/f10-066 2024-05-02T06:51:25Z Atlantic cod ( Gadus morhua ) are being increasingly farmed in net pens adjacent to coastal populations that are currently at historic lows. One concern is that farmed escapees enter local spawning shoals and mate with wild cod. We tested for the potential of escaped farmed cod to interact and hybridize with wild fish by examining the spatial dynamics of, and associations between, fish tagged with ultrasonic transmitters. Based on these data, we also investigated the basic mating system of cod in the field. The spawning ground was best described as a lekking arena. Wild males aggregated near the seafloor and associations between individuals were frequent. Wild females had a pelagic and dispersed distribution and rarely associated with each other. Associations between individual wild males and females were also infrequent. Farmed males rarely associated with wild fish and had core usage areas above the wild males, suggesting that they were not admitted into the spawning arena. Farmed females were over the spawning arena more frequently than wild females and often associated with wild males at the depth of the spawning arena, indicating potential mating with wild males and the possibility of courtship interference. Hence, hybridization between escaped farmed and wild cod is likely. Article in Journal/Newspaper atlantic cod Gadus morhua Canadian Science Publishing Canadian Journal of Fisheries and Aquatic Sciences 67 8 1221 1231 |
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Open Polar |
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Canadian Science Publishing |
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crcansciencepubl |
language |
English |
description |
Atlantic cod ( Gadus morhua ) are being increasingly farmed in net pens adjacent to coastal populations that are currently at historic lows. One concern is that farmed escapees enter local spawning shoals and mate with wild cod. We tested for the potential of escaped farmed cod to interact and hybridize with wild fish by examining the spatial dynamics of, and associations between, fish tagged with ultrasonic transmitters. Based on these data, we also investigated the basic mating system of cod in the field. The spawning ground was best described as a lekking arena. Wild males aggregated near the seafloor and associations between individuals were frequent. Wild females had a pelagic and dispersed distribution and rarely associated with each other. Associations between individual wild males and females were also infrequent. Farmed males rarely associated with wild fish and had core usage areas above the wild males, suggesting that they were not admitted into the spawning arena. Farmed females were over the spawning arena more frequently than wild females and often associated with wild males at the depth of the spawning arena, indicating potential mating with wild males and the possibility of courtship interference. Hence, hybridization between escaped farmed and wild cod is likely. |
author2 |
Marshall, C. Tara |
format |
Article in Journal/Newspaper |
author |
Meager, Justin J. Skjæraasen, Jon Egil Fernö, Anders Løkkeborg, Svein |
spellingShingle |
Meager, Justin J. Skjæraasen, Jon Egil Fernö, Anders Løkkeborg, Svein Reproductive interactions between fugitive farmed and wild Atlantic cod ( Gadus morhua) in the field |
author_facet |
Meager, Justin J. Skjæraasen, Jon Egil Fernö, Anders Løkkeborg, Svein |
author_sort |
Meager, Justin J. |
title |
Reproductive interactions between fugitive farmed and wild Atlantic cod ( Gadus morhua) in the field |
title_short |
Reproductive interactions between fugitive farmed and wild Atlantic cod ( Gadus morhua) in the field |
title_full |
Reproductive interactions between fugitive farmed and wild Atlantic cod ( Gadus morhua) in the field |
title_fullStr |
Reproductive interactions between fugitive farmed and wild Atlantic cod ( Gadus morhua) in the field |
title_full_unstemmed |
Reproductive interactions between fugitive farmed and wild Atlantic cod ( Gadus morhua) in the field |
title_sort |
reproductive interactions between fugitive farmed and wild atlantic cod ( gadus morhua) in the field |
publisher |
Canadian Science Publishing |
publishDate |
2010 |
url |
http://dx.doi.org/10.1139/f10-066 http://www.nrcresearchpress.com/doi/full-xml/10.1139/F10-066 http://www.nrcresearchpress.com/doi/pdf/10.1139/F10-066 |
genre |
atlantic cod Gadus morhua |
genre_facet |
atlantic cod Gadus morhua |
op_source |
Canadian Journal of Fisheries and Aquatic Sciences volume 67, issue 8, page 1221-1231 ISSN 0706-652X 1205-7533 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/f10-066 |
container_title |
Canadian Journal of Fisheries and Aquatic Sciences |
container_volume |
67 |
container_issue |
8 |
container_start_page |
1221 |
op_container_end_page |
1231 |
_version_ |
1799476333844103168 |