Enhancing the reproductive potential of local populations of coastal Atlantic cod ( Gadus morhua )
We investigate the feasibility of enhancing the reproductive potential of northern Atlantic cod (Gadus morhua L.) populations resident in Newfoundland and Labrador bays by "catch, grow out, and release". This entails trapping juvenile and young adult fish from the local population, increas...
Published in: | Canadian Journal of Fisheries and Aquatic Sciences |
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2002
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Online Access: | http://dx.doi.org/10.1139/f02-136 http://www.nrcresearchpress.com/doi/pdf/10.1139/f02-136 |
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crcansciencepubl:10.1139/f02-136 2023-12-17T10:27:01+01:00 Enhancing the reproductive potential of local populations of coastal Atlantic cod ( Gadus morhua ) Wroblewski, J S Hiscock, H W 2002 http://dx.doi.org/10.1139/f02-136 http://www.nrcresearchpress.com/doi/pdf/10.1139/f02-136 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Fisheries and Aquatic Sciences volume 59, issue 10, page 1685-1695 ISSN 0706-652X 1205-7533 Aquatic Science Ecology, Evolution, Behavior and Systematics journal-article 2002 crcansciencepubl https://doi.org/10.1139/f02-136 2023-11-19T13:39:32Z We investigate the feasibility of enhancing the reproductive potential of northern Atlantic cod (Gadus morhua L.) populations resident in Newfoundland and Labrador bays by "catch, grow out, and release". This entails trapping juvenile and young adult fish from the local population, increasing their growth, maturation rate, and potential fecundity by feeding them a natural diet in net pens, and then returning the fish to their natal bay habitat to spawn. To determine whether multiyear farming affects spawning success, we determined the spawning period and egg quality of cod held in captivity for three growth seasons. Farmed cod spawned in a net pen concurrently with wild cod in Trinity Bay during 1995 and produced fertilized eggs from which viable larvae hatched. Sonic tracking showed that cod farmed for 3 years and then released reintegrated with wild cod aggregations over known spawning grounds. Recaptures of tagged fish several years after release suggest that farmed fish remained in the bay as members of the resident population. Fishing mortality (bycatch in coastal fisheries for lumpfish (Cyclopterus lumpus) and winter flounder (Pseudopleuronectes americanus)) of released farmed cod was not negligible, emphasizing that any enhancement effort must be carried out under a complete fishing moratorium. Article in Journal/Newspaper atlantic cod Gadus morhua Newfoundland Canadian Science Publishing (via Crossref) Newfoundland Canadian Journal of Fisheries and Aquatic Sciences 59 10 1685 1695 |
institution |
Open Polar |
collection |
Canadian Science Publishing (via Crossref) |
op_collection_id |
crcansciencepubl |
language |
English |
topic |
Aquatic Science Ecology, Evolution, Behavior and Systematics |
spellingShingle |
Aquatic Science Ecology, Evolution, Behavior and Systematics Wroblewski, J S Hiscock, H W Enhancing the reproductive potential of local populations of coastal Atlantic cod ( Gadus morhua ) |
topic_facet |
Aquatic Science Ecology, Evolution, Behavior and Systematics |
description |
We investigate the feasibility of enhancing the reproductive potential of northern Atlantic cod (Gadus morhua L.) populations resident in Newfoundland and Labrador bays by "catch, grow out, and release". This entails trapping juvenile and young adult fish from the local population, increasing their growth, maturation rate, and potential fecundity by feeding them a natural diet in net pens, and then returning the fish to their natal bay habitat to spawn. To determine whether multiyear farming affects spawning success, we determined the spawning period and egg quality of cod held in captivity for three growth seasons. Farmed cod spawned in a net pen concurrently with wild cod in Trinity Bay during 1995 and produced fertilized eggs from which viable larvae hatched. Sonic tracking showed that cod farmed for 3 years and then released reintegrated with wild cod aggregations over known spawning grounds. Recaptures of tagged fish several years after release suggest that farmed fish remained in the bay as members of the resident population. Fishing mortality (bycatch in coastal fisheries for lumpfish (Cyclopterus lumpus) and winter flounder (Pseudopleuronectes americanus)) of released farmed cod was not negligible, emphasizing that any enhancement effort must be carried out under a complete fishing moratorium. |
format |
Article in Journal/Newspaper |
author |
Wroblewski, J S Hiscock, H W |
author_facet |
Wroblewski, J S Hiscock, H W |
author_sort |
Wroblewski, J S |
title |
Enhancing the reproductive potential of local populations of coastal Atlantic cod ( Gadus morhua ) |
title_short |
Enhancing the reproductive potential of local populations of coastal Atlantic cod ( Gadus morhua ) |
title_full |
Enhancing the reproductive potential of local populations of coastal Atlantic cod ( Gadus morhua ) |
title_fullStr |
Enhancing the reproductive potential of local populations of coastal Atlantic cod ( Gadus morhua ) |
title_full_unstemmed |
Enhancing the reproductive potential of local populations of coastal Atlantic cod ( Gadus morhua ) |
title_sort |
enhancing the reproductive potential of local populations of coastal atlantic cod ( gadus morhua ) |
publisher |
Canadian Science Publishing |
publishDate |
2002 |
url |
http://dx.doi.org/10.1139/f02-136 http://www.nrcresearchpress.com/doi/pdf/10.1139/f02-136 |
geographic |
Newfoundland |
geographic_facet |
Newfoundland |
genre |
atlantic cod Gadus morhua Newfoundland |
genre_facet |
atlantic cod Gadus morhua Newfoundland |
op_source |
Canadian Journal of Fisheries and Aquatic Sciences volume 59, issue 10, page 1685-1695 ISSN 0706-652X 1205-7533 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/f02-136 |
container_title |
Canadian Journal of Fisheries and Aquatic Sciences |
container_volume |
59 |
container_issue |
10 |
container_start_page |
1685 |
op_container_end_page |
1695 |
_version_ |
1785578790350487552 |