Effect of Changes in Recruitment Levels on Multispecies Long-term Predictions
A multispecies model (MSFOR) is used to predict the relative change in equilibrium yield and spawning stock biomass (SSB) of commercially important fish stocks in the North Sea resulting from a reduction in the fishing mortality generated by the roundfish fishery. Because predation mortality is a fu...
Published in: | Canadian Journal of Fisheries and Aquatic Sciences |
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1993
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Online Access: | http://dx.doi.org/10.1139/f93-256 http://www.nrcresearchpress.com/doi/pdf/10.1139/f93-256 |
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crcansciencepubl:10.1139/f93-256 2023-12-17T10:27:04+01:00 Effect of Changes in Recruitment Levels on Multispecies Long-term Predictions Gislason, Henrik 1993 http://dx.doi.org/10.1139/f93-256 http://www.nrcresearchpress.com/doi/pdf/10.1139/f93-256 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Fisheries and Aquatic Sciences volume 50, issue 11, page 2315-2322 ISSN 0706-652X 1205-7533 Aquatic Science Ecology, Evolution, Behavior and Systematics journal-article 1993 crcansciencepubl https://doi.org/10.1139/f93-256 2023-11-19T13:39:12Z A multispecies model (MSFOR) is used to predict the relative change in equilibrium yield and spawning stock biomass (SSB) of commercially important fish stocks in the North Sea resulting from a reduction in the fishing mortality generated by the roundfish fishery. Because predation mortality is a function of the abundance of prey and predators the results will depend on recruitment. Assuming recruitment to be independent of stock sizes the effect of changes in recruitment is studied by repeating the predictions at all possible combinations of ±50% changes in predator and prey recruitment levels. All of the predictions result in a relative increase in the SSB of Atlantic cod (Gadus morhua) and saithe (Pollachius virens) and in a relative decrease in the SSB of Atlantic herring (Clupea harengus) and Norway pout (Trisopterus esmarkii). In these cases the sign of the relative change is robust to recruitment changes. However, for haddock (Melanogrammus aeglefinus), sprat (Sprattus sprattus), and sandeel (Ammodytes marinus) the relative change in SSB is found to be either positive or negative depending on the level of recruitment. The predictions for haddock are highly sensitive to changes in the level of saithe recruitment. Article in Journal/Newspaper atlantic cod Gadus morhua Canadian Science Publishing (via Crossref) Norway Canadian Journal of Fisheries and Aquatic Sciences 50 11 2315 2322 |
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 Gislason, Henrik Effect of Changes in Recruitment Levels on Multispecies Long-term Predictions |
topic_facet |
Aquatic Science Ecology, Evolution, Behavior and Systematics |
description |
A multispecies model (MSFOR) is used to predict the relative change in equilibrium yield and spawning stock biomass (SSB) of commercially important fish stocks in the North Sea resulting from a reduction in the fishing mortality generated by the roundfish fishery. Because predation mortality is a function of the abundance of prey and predators the results will depend on recruitment. Assuming recruitment to be independent of stock sizes the effect of changes in recruitment is studied by repeating the predictions at all possible combinations of ±50% changes in predator and prey recruitment levels. All of the predictions result in a relative increase in the SSB of Atlantic cod (Gadus morhua) and saithe (Pollachius virens) and in a relative decrease in the SSB of Atlantic herring (Clupea harengus) and Norway pout (Trisopterus esmarkii). In these cases the sign of the relative change is robust to recruitment changes. However, for haddock (Melanogrammus aeglefinus), sprat (Sprattus sprattus), and sandeel (Ammodytes marinus) the relative change in SSB is found to be either positive or negative depending on the level of recruitment. The predictions for haddock are highly sensitive to changes in the level of saithe recruitment. |
format |
Article in Journal/Newspaper |
author |
Gislason, Henrik |
author_facet |
Gislason, Henrik |
author_sort |
Gislason, Henrik |
title |
Effect of Changes in Recruitment Levels on Multispecies Long-term Predictions |
title_short |
Effect of Changes in Recruitment Levels on Multispecies Long-term Predictions |
title_full |
Effect of Changes in Recruitment Levels on Multispecies Long-term Predictions |
title_fullStr |
Effect of Changes in Recruitment Levels on Multispecies Long-term Predictions |
title_full_unstemmed |
Effect of Changes in Recruitment Levels on Multispecies Long-term Predictions |
title_sort |
effect of changes in recruitment levels on multispecies long-term predictions |
publisher |
Canadian Science Publishing |
publishDate |
1993 |
url |
http://dx.doi.org/10.1139/f93-256 http://www.nrcresearchpress.com/doi/pdf/10.1139/f93-256 |
geographic |
Norway |
geographic_facet |
Norway |
genre |
atlantic cod Gadus morhua |
genre_facet |
atlantic cod Gadus morhua |
op_source |
Canadian Journal of Fisheries and Aquatic Sciences volume 50, issue 11, page 2315-2322 ISSN 0706-652X 1205-7533 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/f93-256 |
container_title |
Canadian Journal of Fisheries and Aquatic Sciences |
container_volume |
50 |
container_issue |
11 |
container_start_page |
2315 |
op_container_end_page |
2322 |
_version_ |
1785578838522068992 |