Capelin and herring as key species for the yield of north-east Arctic cod. Results from multispecies model runs
A conceptual temperature dependent multispecies model for stock interactions and harvesting of herring, capelin and cod in the Norwegian Sea-Barents Sea region has been developed. The concept presupposes that good recruitment of herring and cod is linked to warm ocean climate, which may occur with a...
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Consejo Superior de Investigaciones Científicas
2003
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ftdoajarticles:oai:doaj.org/article:211760961ea04f8f91fe176a1cd40e99 2023-05-15T14:30:32+02:00 Capelin and herring as key species for the yield of north-east Arctic cod. Results from multispecies model runs Johannes Hamre 2003-04-01T00:00:00Z https://doi.org/10.3989/scimar.2003.67s1315 https://doaj.org/article/211760961ea04f8f91fe176a1cd40e99 EN eng Consejo Superior de Investigaciones Científicas http://scientiamarina.revistas.csic.es/index.php/scientiamarina/article/view/531 https://doaj.org/toc/0214-8358 https://doaj.org/toc/1886-8134 0214-8358 1886-8134 doi:10.3989/scimar.2003.67s1315 https://doaj.org/article/211760961ea04f8f91fe176a1cd40e99 Scientia Marina, Vol 67, Iss S1, Pp 315-323 (2003) multispecies model ecosystem management yield Aquaculture. Fisheries. Angling SH1-691 article 2003 ftdoajarticles https://doi.org/10.3989/scimar.2003.67s1315 2022-12-31T13:51:50Z A conceptual temperature dependent multispecies model for stock interactions and harvesting of herring, capelin and cod in the Norwegian Sea-Barents Sea region has been developed. The concept presupposes that good recruitment of herring and cod is linked to warm ocean climate, which may occur with a frequency of 8 to 10 years. Strong herring year classes overlap the distribution of capelin larvae in 3-4 years causing mass mortality of the capelin fry, and depletion of the capelin stock. At the same time the herring is about to leave the Barents Sea, and lack of food in subsequent years reduces the potential yield of cod. Immature cod is the main predator on mature capelin and cannibalism is an important factor in reducing the abundance of juvenile cod when the capelin stock is rebuilding. The model is used in a study of the effects of different fishery management strategies on stocks and yield. Results show that optimum yield of cod is obtained by high fishing mortality on immature cod from the end of a warm period until the spawning stock of capelin is rebuilt. This fishing strategy will result in large fluctuation in the yearly cod catches but yield an optimum average biomass production of capelin and an optimum potential catch of cod. These results are in accordance with the catch history of cod. Prior to the 1970s, the effort of the fishery in the Barents Sea followed to a large extent the abundance of immature cod, resulting in large catches when the stock was abundant. The yearly catches varied from 0.4 to 1.3 million tonnes, but the average catch obtained in the two periods 1950-1958 and 1959-1969 are the highest on record. Moreover, the trawlers fished with small meshes in the cod end, discarding considerable quantities of the smallest fish. It is concluded that the interaction between climate and fish stocks, and fish stock interactions in the north east Atlantic region, are of fundamental importance to the dynamic of the processes which govern the fish production of the region. Article in Journal/Newspaper Arctic cod Arctic Barents Sea North East Atlantic Norwegian Sea Directory of Open Access Journals: DOAJ Articles Arctic Barents Sea Norwegian Sea Scientia Marina 67 S1 315 323 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
multispecies model ecosystem management yield Aquaculture. Fisheries. Angling SH1-691 |
spellingShingle |
multispecies model ecosystem management yield Aquaculture. Fisheries. Angling SH1-691 Johannes Hamre Capelin and herring as key species for the yield of north-east Arctic cod. Results from multispecies model runs |
topic_facet |
multispecies model ecosystem management yield Aquaculture. Fisheries. Angling SH1-691 |
description |
A conceptual temperature dependent multispecies model for stock interactions and harvesting of herring, capelin and cod in the Norwegian Sea-Barents Sea region has been developed. The concept presupposes that good recruitment of herring and cod is linked to warm ocean climate, which may occur with a frequency of 8 to 10 years. Strong herring year classes overlap the distribution of capelin larvae in 3-4 years causing mass mortality of the capelin fry, and depletion of the capelin stock. At the same time the herring is about to leave the Barents Sea, and lack of food in subsequent years reduces the potential yield of cod. Immature cod is the main predator on mature capelin and cannibalism is an important factor in reducing the abundance of juvenile cod when the capelin stock is rebuilding. The model is used in a study of the effects of different fishery management strategies on stocks and yield. Results show that optimum yield of cod is obtained by high fishing mortality on immature cod from the end of a warm period until the spawning stock of capelin is rebuilt. This fishing strategy will result in large fluctuation in the yearly cod catches but yield an optimum average biomass production of capelin and an optimum potential catch of cod. These results are in accordance with the catch history of cod. Prior to the 1970s, the effort of the fishery in the Barents Sea followed to a large extent the abundance of immature cod, resulting in large catches when the stock was abundant. The yearly catches varied from 0.4 to 1.3 million tonnes, but the average catch obtained in the two periods 1950-1958 and 1959-1969 are the highest on record. Moreover, the trawlers fished with small meshes in the cod end, discarding considerable quantities of the smallest fish. It is concluded that the interaction between climate and fish stocks, and fish stock interactions in the north east Atlantic region, are of fundamental importance to the dynamic of the processes which govern the fish production of the region. |
format |
Article in Journal/Newspaper |
author |
Johannes Hamre |
author_facet |
Johannes Hamre |
author_sort |
Johannes Hamre |
title |
Capelin and herring as key species for the yield of north-east Arctic cod. Results from multispecies model runs |
title_short |
Capelin and herring as key species for the yield of north-east Arctic cod. Results from multispecies model runs |
title_full |
Capelin and herring as key species for the yield of north-east Arctic cod. Results from multispecies model runs |
title_fullStr |
Capelin and herring as key species for the yield of north-east Arctic cod. Results from multispecies model runs |
title_full_unstemmed |
Capelin and herring as key species for the yield of north-east Arctic cod. Results from multispecies model runs |
title_sort |
capelin and herring as key species for the yield of north-east arctic cod. results from multispecies model runs |
publisher |
Consejo Superior de Investigaciones Científicas |
publishDate |
2003 |
url |
https://doi.org/10.3989/scimar.2003.67s1315 https://doaj.org/article/211760961ea04f8f91fe176a1cd40e99 |
geographic |
Arctic Barents Sea Norwegian Sea |
geographic_facet |
Arctic Barents Sea Norwegian Sea |
genre |
Arctic cod Arctic Barents Sea North East Atlantic Norwegian Sea |
genre_facet |
Arctic cod Arctic Barents Sea North East Atlantic Norwegian Sea |
op_source |
Scientia Marina, Vol 67, Iss S1, Pp 315-323 (2003) |
op_relation |
http://scientiamarina.revistas.csic.es/index.php/scientiamarina/article/view/531 https://doaj.org/toc/0214-8358 https://doaj.org/toc/1886-8134 0214-8358 1886-8134 doi:10.3989/scimar.2003.67s1315 https://doaj.org/article/211760961ea04f8f91fe176a1cd40e99 |
op_doi |
https://doi.org/10.3989/scimar.2003.67s1315 |
container_title |
Scientia Marina |
container_volume |
67 |
container_issue |
S1 |
container_start_page |
315 |
op_container_end_page |
323 |
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1766304365792985088 |