Yield isopleths of the halibut, hippoglossus hippoglossus, in northern Norway
1. Data on age composition, growth, and mortality rates of the halibut, Hippoglossus hippoglossus, collected in Finmark, 1956-1960, supplemented with data on immature halibut from various localities in Northern Norway were examined. 2. A weight-length relationship was determined separately for males...
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[Fiskeridirektoratets havforskningsinstitutt]
1968
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ftimr:oai:imr.brage.unit.no:11250/114704 2023-05-15T17:43:19+02:00 Yield isopleths of the halibut, hippoglossus hippoglossus, in northern Norway Mathisen, Ole A. Olsen, Steinar 1968 1150841 bytes application/pdf http://hdl.handle.net/11250/114704 eng eng [Fiskeridirektoratets havforskningsinstitutt] Fiskeridirektoratets skrifter, Serie Havundersøkelser vol 14 no 3 http://hdl.handle.net/11250/114704 s. 129-159 Research report 1968 ftimr 2021-09-23T20:15:08Z 1. Data on age composition, growth, and mortality rates of the halibut, Hippoglossus hippoglossus, collected in Finmark, 1956-1960, supplemented with data on immature halibut from various localities in Northern Norway were examined. 2. A weight-length relationship was determined separately for males and females. 3. Total instantaneous mortality rate was determined for males and females based on age composition data. 2. Yield isopleths were calculated based on a knife-edged selection curve into the fishery and also on prolonged recruitment. In the latter case variable fishing effort was applied to the age groups to simulate the recruitment into the fishery and withdrawal away from the fishable stock of the large females. 5. A precise determination of maximum length or weight, natural and fishing mortality rate were not achieved. Hence the change in yield per recruit could only be suggested as a function of age at entry into the fishery and fishing mortality. Report Northern Norway Institute for Marine Research: Brage IMR Norway |
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Open Polar |
collection |
Institute for Marine Research: Brage IMR |
op_collection_id |
ftimr |
language |
English |
description |
1. Data on age composition, growth, and mortality rates of the halibut, Hippoglossus hippoglossus, collected in Finmark, 1956-1960, supplemented with data on immature halibut from various localities in Northern Norway were examined. 2. A weight-length relationship was determined separately for males and females. 3. Total instantaneous mortality rate was determined for males and females based on age composition data. 2. Yield isopleths were calculated based on a knife-edged selection curve into the fishery and also on prolonged recruitment. In the latter case variable fishing effort was applied to the age groups to simulate the recruitment into the fishery and withdrawal away from the fishable stock of the large females. 5. A precise determination of maximum length or weight, natural and fishing mortality rate were not achieved. Hence the change in yield per recruit could only be suggested as a function of age at entry into the fishery and fishing mortality. |
format |
Report |
author |
Mathisen, Ole A. Olsen, Steinar |
spellingShingle |
Mathisen, Ole A. Olsen, Steinar Yield isopleths of the halibut, hippoglossus hippoglossus, in northern Norway |
author_facet |
Mathisen, Ole A. Olsen, Steinar |
author_sort |
Mathisen, Ole A. |
title |
Yield isopleths of the halibut, hippoglossus hippoglossus, in northern Norway |
title_short |
Yield isopleths of the halibut, hippoglossus hippoglossus, in northern Norway |
title_full |
Yield isopleths of the halibut, hippoglossus hippoglossus, in northern Norway |
title_fullStr |
Yield isopleths of the halibut, hippoglossus hippoglossus, in northern Norway |
title_full_unstemmed |
Yield isopleths of the halibut, hippoglossus hippoglossus, in northern Norway |
title_sort |
yield isopleths of the halibut, hippoglossus hippoglossus, in northern norway |
publisher |
[Fiskeridirektoratets havforskningsinstitutt] |
publishDate |
1968 |
url |
http://hdl.handle.net/11250/114704 |
geographic |
Norway |
geographic_facet |
Norway |
genre |
Northern Norway |
genre_facet |
Northern Norway |
op_source |
s. 129-159 |
op_relation |
Fiskeridirektoratets skrifter, Serie Havundersøkelser vol 14 no 3 http://hdl.handle.net/11250/114704 |
_version_ |
1766145354349150208 |