Influence of maternal effects and environmental conditions on growth and survival of Atlantic cod (Gadus morhua L.)
Commercially exploited stocks that have experienced declines in population abundance have responded by altering life history traits of growth and maturation. Cod is not only becoming mature at an earlier age but also, the majority of the stock comprises fishes with no previous spawning experience. A...
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ftoceanrep:oai:oceanrep.geomar.de:578 2024-09-30T14:32:10+00:00 Influence of maternal effects and environmental conditions on growth and survival of Atlantic cod (Gadus morhua L.) Bühler, Vivian 2004 text https://oceanrep.geomar.de/id/eprint/578/ https://oceanrep.geomar.de/id/eprint/578/1/611_B%C3%BChler_2004_InfluenceOfMaternalEffectsAnd_Hschri_pubid6077.pdf https://macau.uni-kiel.de/receive/diss_mods_00001554 en eng https://oceanrep.geomar.de/id/eprint/578/1/611_B%C3%BChler_2004_InfluenceOfMaternalEffectsAnd_Hschri_pubid6077.pdf Bühler, V. (2004) Influence of maternal effects and environmental conditions on growth and survival of Atlantic cod (Gadus morhua L.). Open Access (PhD/ Doctoral thesis), Christian-Albrechts-Universität, Kiel, Germany, 109 pp. UrhG info:eu-repo/semantics/openAccess Thesis NonPeerReviewed 2004 ftoceanrep 2024-09-04T05:04:40Z Commercially exploited stocks that have experienced declines in population abundance have responded by altering life history traits of growth and maturation. Cod is not only becoming mature at an earlier age but also, the majority of the stock comprises fishes with no previous spawning experience. Actual fisheries management does not take in account qualitative differences within the spawning stock. If the stock responds to continued exploitation by shifting maturity to an earlier stage, fish will spawn at smaller sizes. They will produce smaller eggs, and consequently small and less viable larvae, so that the contribution to the spawning stock biomass will be less than expected. There are many advantages for delaying maturation: Larger and heavier fish will be better conditioned for spawning, have higher fecundity and larger eggs that are more viable. Harvesting at delayed recruitment enables the stock to maintain a larger SSB with an expanded age structure while supporting a sustainable fishery. Thesis atlantic cod Gadus morhua OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
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OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
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language |
English |
description |
Commercially exploited stocks that have experienced declines in population abundance have responded by altering life history traits of growth and maturation. Cod is not only becoming mature at an earlier age but also, the majority of the stock comprises fishes with no previous spawning experience. Actual fisheries management does not take in account qualitative differences within the spawning stock. If the stock responds to continued exploitation by shifting maturity to an earlier stage, fish will spawn at smaller sizes. They will produce smaller eggs, and consequently small and less viable larvae, so that the contribution to the spawning stock biomass will be less than expected. There are many advantages for delaying maturation: Larger and heavier fish will be better conditioned for spawning, have higher fecundity and larger eggs that are more viable. Harvesting at delayed recruitment enables the stock to maintain a larger SSB with an expanded age structure while supporting a sustainable fishery. |
format |
Thesis |
author |
Bühler, Vivian |
spellingShingle |
Bühler, Vivian Influence of maternal effects and environmental conditions on growth and survival of Atlantic cod (Gadus morhua L.) |
author_facet |
Bühler, Vivian |
author_sort |
Bühler, Vivian |
title |
Influence of maternal effects and environmental conditions on growth and survival of Atlantic cod (Gadus morhua L.) |
title_short |
Influence of maternal effects and environmental conditions on growth and survival of Atlantic cod (Gadus morhua L.) |
title_full |
Influence of maternal effects and environmental conditions on growth and survival of Atlantic cod (Gadus morhua L.) |
title_fullStr |
Influence of maternal effects and environmental conditions on growth and survival of Atlantic cod (Gadus morhua L.) |
title_full_unstemmed |
Influence of maternal effects and environmental conditions on growth and survival of Atlantic cod (Gadus morhua L.) |
title_sort |
influence of maternal effects and environmental conditions on growth and survival of atlantic cod (gadus morhua l.) |
publishDate |
2004 |
url |
https://oceanrep.geomar.de/id/eprint/578/ https://oceanrep.geomar.de/id/eprint/578/1/611_B%C3%BChler_2004_InfluenceOfMaternalEffectsAnd_Hschri_pubid6077.pdf https://macau.uni-kiel.de/receive/diss_mods_00001554 |
genre |
atlantic cod Gadus morhua |
genre_facet |
atlantic cod Gadus morhua |
op_relation |
https://oceanrep.geomar.de/id/eprint/578/1/611_B%C3%BChler_2004_InfluenceOfMaternalEffectsAnd_Hschri_pubid6077.pdf Bühler, V. (2004) Influence of maternal effects and environmental conditions on growth and survival of Atlantic cod (Gadus morhua L.). Open Access (PhD/ Doctoral thesis), Christian-Albrechts-Universität, Kiel, Germany, 109 pp. |
op_rights |
UrhG info:eu-repo/semantics/openAccess |
_version_ |
1811636403926204416 |