Otolith growth and zone formation during first maturity and spawning of Atlantic cod ( Gadus morhua)
Specific impacts of somatic growth, sexual maturation, and spawning events on otolith zone formation in Atlantic cod (Gadus morhua) were assessed in a 33-month tank experiment, using Barents Sea cod and Norwegian coastal cod. High and low feeding ration combinations were used to mimic environmental...
Published in: | Canadian Journal of Fisheries and Aquatic Sciences |
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crcansciencepubl:10.1139/cjfas-2019-0033 2024-09-15T17:55:24+00:00 Otolith growth and zone formation during first maturity and spawning of Atlantic cod ( Gadus morhua) Irgens, Christian Folkvord, Arild Otterå, Håkon Kjesbu, Olav S. 2020 http://dx.doi.org/10.1139/cjfas-2019-0033 http://www.nrcresearchpress.com/doi/full-xml/10.1139/cjfas-2019-0033 http://www.nrcresearchpress.com/doi/pdf/10.1139/cjfas-2019-0033 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Fisheries and Aquatic Sciences volume 77, issue 1, page 113-123 ISSN 0706-652X 1205-7533 journal-article 2020 crcansciencepubl https://doi.org/10.1139/cjfas-2019-0033 2024-08-08T04:13:36Z Specific impacts of somatic growth, sexual maturation, and spawning events on otolith zone formation in Atlantic cod (Gadus morhua) were assessed in a 33-month tank experiment, using Barents Sea cod and Norwegian coastal cod. High and low feeding ration combinations were used to mimic environmental stressors in the field. For both stocks, apparent macrostructural “spawning zones” in otoliths are registered in statutory stock monitoring programs to estimate age at maturity, thus adding key information to stock biomass assessments. We found that substantial energy investments in reproduction caused reductions in otolith growth and altered proportional width between translucent and opaque zones. These effects, however, were only statistically significant among individuals with high reproductive investments, while otoliths from individuals with low investments did not differ from the otoliths for immatures. Reproduction may thus not necessarily induce spawning zones, and alternatively, spawning zones may not necessarily reflect reproduction. Altogether, this suggests that the individual energy level, as a premise for metabolic activity, plays a key role in the formation of such zones and thus is related to environmental conditions. Article in Journal/Newspaper atlantic cod Barents Sea Gadus morhua Canadian Science Publishing Canadian Journal of Fisheries and Aquatic Sciences 77 1 113 123 |
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Open Polar |
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Canadian Science Publishing |
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crcansciencepubl |
language |
English |
description |
Specific impacts of somatic growth, sexual maturation, and spawning events on otolith zone formation in Atlantic cod (Gadus morhua) were assessed in a 33-month tank experiment, using Barents Sea cod and Norwegian coastal cod. High and low feeding ration combinations were used to mimic environmental stressors in the field. For both stocks, apparent macrostructural “spawning zones” in otoliths are registered in statutory stock monitoring programs to estimate age at maturity, thus adding key information to stock biomass assessments. We found that substantial energy investments in reproduction caused reductions in otolith growth and altered proportional width between translucent and opaque zones. These effects, however, were only statistically significant among individuals with high reproductive investments, while otoliths from individuals with low investments did not differ from the otoliths for immatures. Reproduction may thus not necessarily induce spawning zones, and alternatively, spawning zones may not necessarily reflect reproduction. Altogether, this suggests that the individual energy level, as a premise for metabolic activity, plays a key role in the formation of such zones and thus is related to environmental conditions. |
format |
Article in Journal/Newspaper |
author |
Irgens, Christian Folkvord, Arild Otterå, Håkon Kjesbu, Olav S. |
spellingShingle |
Irgens, Christian Folkvord, Arild Otterå, Håkon Kjesbu, Olav S. Otolith growth and zone formation during first maturity and spawning of Atlantic cod ( Gadus morhua) |
author_facet |
Irgens, Christian Folkvord, Arild Otterå, Håkon Kjesbu, Olav S. |
author_sort |
Irgens, Christian |
title |
Otolith growth and zone formation during first maturity and spawning of Atlantic cod ( Gadus morhua) |
title_short |
Otolith growth and zone formation during first maturity and spawning of Atlantic cod ( Gadus morhua) |
title_full |
Otolith growth and zone formation during first maturity and spawning of Atlantic cod ( Gadus morhua) |
title_fullStr |
Otolith growth and zone formation during first maturity and spawning of Atlantic cod ( Gadus morhua) |
title_full_unstemmed |
Otolith growth and zone formation during first maturity and spawning of Atlantic cod ( Gadus morhua) |
title_sort |
otolith growth and zone formation during first maturity and spawning of atlantic cod ( gadus morhua) |
publisher |
Canadian Science Publishing |
publishDate |
2020 |
url |
http://dx.doi.org/10.1139/cjfas-2019-0033 http://www.nrcresearchpress.com/doi/full-xml/10.1139/cjfas-2019-0033 http://www.nrcresearchpress.com/doi/pdf/10.1139/cjfas-2019-0033 |
genre |
atlantic cod Barents Sea Gadus morhua |
genre_facet |
atlantic cod Barents Sea Gadus morhua |
op_source |
Canadian Journal of Fisheries and Aquatic Sciences volume 77, issue 1, page 113-123 ISSN 0706-652X 1205-7533 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/cjfas-2019-0033 |
container_title |
Canadian Journal of Fisheries and Aquatic Sciences |
container_volume |
77 |
container_issue |
1 |
container_start_page |
113 |
op_container_end_page |
123 |
_version_ |
1810431697609555968 |