Farmed cod escapees and net-pen spawning left no clear genetic footprint in the local wild cod population
This study investigated a potential genetic introgression from farmed to wild cod Gadus morhua L. in the Trondheimsfjord, Norway. During the first 2 yr of operation of a cod farm in the inner part of the fjord, 2 large escape events and extensive pen spawning were reported. Analyses of 4 allozyme ma...
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ftdoajarticles:oai:doaj.org/article:577d49d8e8c14743b0fa6c27f607be89 2023-05-15T16:19:16+02:00 Farmed cod escapees and net-pen spawning left no clear genetic footprint in the local wild cod population R Varne KL Kunz T Johansen JI Westgaard I Uglem J Mork 2015-11-01T00:00:00Z https://doi.org/10.3354/aei00153 https://doaj.org/article/577d49d8e8c14743b0fa6c27f607be89 EN eng Inter-Research https://www.int-res.com/abstracts/aei/v7/n3/p253-266/ https://doaj.org/toc/1869-215X https://doaj.org/toc/1869-7534 1869-215X 1869-7534 doi:10.3354/aei00153 https://doaj.org/article/577d49d8e8c14743b0fa6c27f607be89 Aquaculture Environment Interactions, Vol 7, Iss 3, Pp 253-266 (2015) Aquaculture. Fisheries. Angling SH1-691 Ecology QH540-549.5 article 2015 ftdoajarticles https://doi.org/10.3354/aei00153 2022-12-31T09:14:11Z This study investigated a potential genetic introgression from farmed to wild cod Gadus morhua L. in the Trondheimsfjord, Norway. During the first 2 yr of operation of a cod farm in the inner part of the fjord, 2 large escape events and extensive pen spawning were reported. Analyses of 4 allozyme markers revealed no significant changes in allele frequencies between samples of wild cod before and after cod farming, although prominent allele frequency differences were demonstrated between wild and farmed samples. Analyses of 10 DNA markers showed a significant change between pre- and post-farming samples, due to contradictory allele frequency differences at Tch11, Pan I and Gmo132. Excluding those 3 markers due to null alleles (Tch11) and selection (Gmo132 and Pan I), the DNA markers paralleled the non-changed allele frequency signal from the allozymes. The topographies of the allozyme- and DNA-based dendrogram of the samples were congruent. Recaptures of tagged and released farmed cod indicated a seemingly random diffusion throughout the fjord and ended after approx. 6 mo. During an ongoing pen spawning, plankton net surveys sampling for cod eggs in the surroundings of the cod farm suggested the eggs originated from the farm. No larvae were present in the plankton samples. The apparent absence of introgression is explained relative to fitness and survival of pen-spawned larvae and adult escapees, and to a purging effect of the estuarine circulation of the Trondheimsfjord. Article in Journal/Newspaper Gadus morhua Directory of Open Access Journals: DOAJ Articles Norway Aquaculture Environment Interactions 7 3 253 266 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Aquaculture. Fisheries. Angling SH1-691 Ecology QH540-549.5 |
spellingShingle |
Aquaculture. Fisheries. Angling SH1-691 Ecology QH540-549.5 R Varne KL Kunz T Johansen JI Westgaard I Uglem J Mork Farmed cod escapees and net-pen spawning left no clear genetic footprint in the local wild cod population |
topic_facet |
Aquaculture. Fisheries. Angling SH1-691 Ecology QH540-549.5 |
description |
This study investigated a potential genetic introgression from farmed to wild cod Gadus morhua L. in the Trondheimsfjord, Norway. During the first 2 yr of operation of a cod farm in the inner part of the fjord, 2 large escape events and extensive pen spawning were reported. Analyses of 4 allozyme markers revealed no significant changes in allele frequencies between samples of wild cod before and after cod farming, although prominent allele frequency differences were demonstrated between wild and farmed samples. Analyses of 10 DNA markers showed a significant change between pre- and post-farming samples, due to contradictory allele frequency differences at Tch11, Pan I and Gmo132. Excluding those 3 markers due to null alleles (Tch11) and selection (Gmo132 and Pan I), the DNA markers paralleled the non-changed allele frequency signal from the allozymes. The topographies of the allozyme- and DNA-based dendrogram of the samples were congruent. Recaptures of tagged and released farmed cod indicated a seemingly random diffusion throughout the fjord and ended after approx. 6 mo. During an ongoing pen spawning, plankton net surveys sampling for cod eggs in the surroundings of the cod farm suggested the eggs originated from the farm. No larvae were present in the plankton samples. The apparent absence of introgression is explained relative to fitness and survival of pen-spawned larvae and adult escapees, and to a purging effect of the estuarine circulation of the Trondheimsfjord. |
format |
Article in Journal/Newspaper |
author |
R Varne KL Kunz T Johansen JI Westgaard I Uglem J Mork |
author_facet |
R Varne KL Kunz T Johansen JI Westgaard I Uglem J Mork |
author_sort |
R Varne |
title |
Farmed cod escapees and net-pen spawning left no clear genetic footprint in the local wild cod population |
title_short |
Farmed cod escapees and net-pen spawning left no clear genetic footprint in the local wild cod population |
title_full |
Farmed cod escapees and net-pen spawning left no clear genetic footprint in the local wild cod population |
title_fullStr |
Farmed cod escapees and net-pen spawning left no clear genetic footprint in the local wild cod population |
title_full_unstemmed |
Farmed cod escapees and net-pen spawning left no clear genetic footprint in the local wild cod population |
title_sort |
farmed cod escapees and net-pen spawning left no clear genetic footprint in the local wild cod population |
publisher |
Inter-Research |
publishDate |
2015 |
url |
https://doi.org/10.3354/aei00153 https://doaj.org/article/577d49d8e8c14743b0fa6c27f607be89 |
geographic |
Norway |
geographic_facet |
Norway |
genre |
Gadus morhua |
genre_facet |
Gadus morhua |
op_source |
Aquaculture Environment Interactions, Vol 7, Iss 3, Pp 253-266 (2015) |
op_relation |
https://www.int-res.com/abstracts/aei/v7/n3/p253-266/ https://doaj.org/toc/1869-215X https://doaj.org/toc/1869-7534 1869-215X 1869-7534 doi:10.3354/aei00153 https://doaj.org/article/577d49d8e8c14743b0fa6c27f607be89 |
op_doi |
https://doi.org/10.3354/aei00153 |
container_title |
Aquaculture Environment Interactions |
container_volume |
7 |
container_issue |
3 |
container_start_page |
253 |
op_container_end_page |
266 |
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1766005639816937472 |