Timing and determination of potential fecundity in Atlantic cod (Gadus morhua)
Studies using annual averages of lipid storage or estimated quality of the feeding season have shown that energy reserves influence egg production in Atlantic cod (Gadus morhua). However, vitellogenesis starts months before spawning. Therefore, energy reserves near the start of vitellogenesis might...
Published in: | Canadian Journal of Fisheries and Aquatic Sciences |
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Online Access: | http://hdl.handle.net/11250/108900 https://doi.org/10.1139/F05-218 |
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ftimr:oai:imr.brage.unit.no:11250/108900 2023-05-15T15:27:11+02:00 Timing and determination of potential fecundity in Atlantic cod (Gadus morhua) Skjæraasen, Jon Egil Nilsen, Trygve Kjesbu, Olav Sigurd 2005 571031 bytes application/pdf http://hdl.handle.net/11250/108900 https://doi.org/10.1139/F05-218 eng eng urn:issn:0706-652X http://hdl.handle.net/11250/108900 http://dx.doi.org/10.1139/F05-218 310-320 63 Canadian Journal of Fisheries and Aquatic Sciences 2 cod egg production eggproduksjon recruitment rekruttering torsk Journal article Peer reviewed 2005 ftimr https://doi.org/10.1139/F05-218 2021-09-23T20:15:41Z Studies using annual averages of lipid storage or estimated quality of the feeding season have shown that energy reserves influence egg production in Atlantic cod (Gadus morhua). However, vitellogenesis starts months before spawning. Therefore, energy reserves near the start of vitellogenesis might provide better proxies of fecundity and hence egg production than yearly averages. If so, proxies with large temporal variations (e.g., weight and lipid energy) should vary similarly in their predictive power, and females with different spawning periods should have their fecundity determined at different times. We exposed cod to two photoperiods to induce different spawning seasons. Growth before spawning was monitored, and potential fecundity was measured at the onset of spawning. The date yielding the greatest explanatory power differed between photoperiods. As proxies, length varied less and had lower explanatory power than weight. Lipid energy at the onset of spawning was a poor proxy. The greatest explanatory power was found ~3–4 months before spawning around the start of vitellogenesis, indicating that potential fecundity was highly influenced by female energy reserves at this time. Determination of potential fecundity early in vitellogenesis may be a common feature for determinate teleost spawners. Article in Journal/Newspaper atlantic cod Gadus morhua Institute for Marine Research: Brage IMR Canadian Journal of Fisheries and Aquatic Sciences 63 2 310 320 |
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Open Polar |
collection |
Institute for Marine Research: Brage IMR |
op_collection_id |
ftimr |
language |
English |
topic |
cod egg production eggproduksjon recruitment rekruttering torsk |
spellingShingle |
cod egg production eggproduksjon recruitment rekruttering torsk Skjæraasen, Jon Egil Nilsen, Trygve Kjesbu, Olav Sigurd Timing and determination of potential fecundity in Atlantic cod (Gadus morhua) |
topic_facet |
cod egg production eggproduksjon recruitment rekruttering torsk |
description |
Studies using annual averages of lipid storage or estimated quality of the feeding season have shown that energy reserves influence egg production in Atlantic cod (Gadus morhua). However, vitellogenesis starts months before spawning. Therefore, energy reserves near the start of vitellogenesis might provide better proxies of fecundity and hence egg production than yearly averages. If so, proxies with large temporal variations (e.g., weight and lipid energy) should vary similarly in their predictive power, and females with different spawning periods should have their fecundity determined at different times. We exposed cod to two photoperiods to induce different spawning seasons. Growth before spawning was monitored, and potential fecundity was measured at the onset of spawning. The date yielding the greatest explanatory power differed between photoperiods. As proxies, length varied less and had lower explanatory power than weight. Lipid energy at the onset of spawning was a poor proxy. The greatest explanatory power was found ~3–4 months before spawning around the start of vitellogenesis, indicating that potential fecundity was highly influenced by female energy reserves at this time. Determination of potential fecundity early in vitellogenesis may be a common feature for determinate teleost spawners. |
format |
Article in Journal/Newspaper |
author |
Skjæraasen, Jon Egil Nilsen, Trygve Kjesbu, Olav Sigurd |
author_facet |
Skjæraasen, Jon Egil Nilsen, Trygve Kjesbu, Olav Sigurd |
author_sort |
Skjæraasen, Jon Egil |
title |
Timing and determination of potential fecundity in Atlantic cod (Gadus morhua) |
title_short |
Timing and determination of potential fecundity in Atlantic cod (Gadus morhua) |
title_full |
Timing and determination of potential fecundity in Atlantic cod (Gadus morhua) |
title_fullStr |
Timing and determination of potential fecundity in Atlantic cod (Gadus morhua) |
title_full_unstemmed |
Timing and determination of potential fecundity in Atlantic cod (Gadus morhua) |
title_sort |
timing and determination of potential fecundity in atlantic cod (gadus morhua) |
publishDate |
2005 |
url |
http://hdl.handle.net/11250/108900 https://doi.org/10.1139/F05-218 |
genre |
atlantic cod Gadus morhua |
genre_facet |
atlantic cod Gadus morhua |
op_source |
310-320 63 Canadian Journal of Fisheries and Aquatic Sciences 2 |
op_relation |
urn:issn:0706-652X http://hdl.handle.net/11250/108900 http://dx.doi.org/10.1139/F05-218 |
op_doi |
https://doi.org/10.1139/F05-218 |
container_title |
Canadian Journal of Fisheries and Aquatic Sciences |
container_volume |
63 |
container_issue |
2 |
container_start_page |
310 |
op_container_end_page |
320 |
_version_ |
1766357638224805888 |