Capelin and herring as key species for the yield of cod: Results from multispecies model runs
Management strategies for the fish stocks in the Barents sea. Proceedings of the 8th Norwegian-Russian Symposium. Bergen, 15-16 June 1999. A conceptual multispecies model for the fishery of capelin, cod and herring (Systmod) in the Norwegian Sea-Barents Sea region has been developed and used in anal...
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ftimr:oai:imr.brage.unit.no:11250/107517 2023-05-15T15:38:39+02:00 Capelin and herring as key species for the yield of cod: Results from multispecies model runs Hamre, Johannes 2002 2288449 bytes application/pdf http://hdl.handle.net/11250/107517 eng eng IMR/PINRO Joint Report Series 5/2002 urn:issn:1502-8828 http://hdl.handle.net/11250/107517 VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920 Conference object 2002 ftimr 2021-09-23T20:15:30Z Management strategies for the fish stocks in the Barents sea. Proceedings of the 8th Norwegian-Russian Symposium. Bergen, 15-16 June 1999. A conceptual multispecies model for the fishery of capelin, cod and herring (Systmod) in the Norwegian Sea-Barents Sea region has been developed and used in analysing the impact of different fishery management strategies on stock and yield. The study shows that the biomass production of capelin is the most important factor for the obtainable yield of cod, and the recruitment and life pattern of the herring govern the recruitment of capelin. The recruitment of herring and cod is linked to the ocean climate, which may alternate with warm and cold periods. Cannibalism is also an important factor for cod in adapting to the periodic changes of the system. Most of the production takes place in the warm periods, and capelin and cod have to be harvested when the stocks are large in order to obtain an optimal sustainable catch. The stocks cannot be accumulated in their most productive phase for the benefit of increased catches when the biomass production is low, due to the short life span of capelin, and to the stock interrelationship between the two species. The sustainable yield of herring is more dependent on climate changes than on the stock interrelationships and may be harvested with the constant yearly catch quotas if the time lags between the warm periods are short. A high frequency of warm periods is favourable for the herring, but has a negative effect on the obtainable yield of capelin and cod. Long time lags between strong herring year classes in the Barents Sea provide more time for rebuilding and growth of the capelin stock, which is the condition for high biomass production of cod. Conference Object Barents Sea Norwegian Sea Institute for Marine Research: Brage IMR Barents Sea Bergen Norwegian Sea |
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Institute for Marine Research: Brage IMR |
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English |
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VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920 |
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VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920 Hamre, Johannes Capelin and herring as key species for the yield of cod: Results from multispecies model runs |
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VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920 |
description |
Management strategies for the fish stocks in the Barents sea. Proceedings of the 8th Norwegian-Russian Symposium. Bergen, 15-16 June 1999. A conceptual multispecies model for the fishery of capelin, cod and herring (Systmod) in the Norwegian Sea-Barents Sea region has been developed and used in analysing the impact of different fishery management strategies on stock and yield. The study shows that the biomass production of capelin is the most important factor for the obtainable yield of cod, and the recruitment and life pattern of the herring govern the recruitment of capelin. The recruitment of herring and cod is linked to the ocean climate, which may alternate with warm and cold periods. Cannibalism is also an important factor for cod in adapting to the periodic changes of the system. Most of the production takes place in the warm periods, and capelin and cod have to be harvested when the stocks are large in order to obtain an optimal sustainable catch. The stocks cannot be accumulated in their most productive phase for the benefit of increased catches when the biomass production is low, due to the short life span of capelin, and to the stock interrelationship between the two species. The sustainable yield of herring is more dependent on climate changes than on the stock interrelationships and may be harvested with the constant yearly catch quotas if the time lags between the warm periods are short. A high frequency of warm periods is favourable for the herring, but has a negative effect on the obtainable yield of capelin and cod. Long time lags between strong herring year classes in the Barents Sea provide more time for rebuilding and growth of the capelin stock, which is the condition for high biomass production of cod. |
format |
Conference Object |
author |
Hamre, Johannes |
author_facet |
Hamre, Johannes |
author_sort |
Hamre, Johannes |
title |
Capelin and herring as key species for the yield of cod: Results from multispecies model runs |
title_short |
Capelin and herring as key species for the yield of cod: Results from multispecies model runs |
title_full |
Capelin and herring as key species for the yield of cod: Results from multispecies model runs |
title_fullStr |
Capelin and herring as key species for the yield of cod: Results from multispecies model runs |
title_full_unstemmed |
Capelin and herring as key species for the yield of cod: Results from multispecies model runs |
title_sort |
capelin and herring as key species for the yield of cod: results from multispecies model runs |
publishDate |
2002 |
url |
http://hdl.handle.net/11250/107517 |
geographic |
Barents Sea Bergen Norwegian Sea |
geographic_facet |
Barents Sea Bergen Norwegian Sea |
genre |
Barents Sea Norwegian Sea |
genre_facet |
Barents Sea Norwegian Sea |
op_relation |
IMR/PINRO Joint Report Series 5/2002 urn:issn:1502-8828 http://hdl.handle.net/11250/107517 |
_version_ |
1766369863745404928 |