Variation in annual egg production in individual captive Atlantic cod (Gadus morhua)
Variability in the annual egg production of hatchery-reared Atlantic cod (Gadus morhua) was determined under stable experimental conditions. Egg size increased with fish age as an approximate step function. Comparing first- and second-time spawners, the variance in egg dry weight was 32% within indi...
Published in: | Canadian Journal of Fisheries and Aquatic Sciences |
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Language: | English |
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1996
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Online Access: | http://hdl.handle.net/11250/109284 https://doi.org/10.1139/f95-215 |
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ftimr:oai:imr.brage.unit.no:11250/109284 2023-05-15T15:27:11+02:00 Variation in annual egg production in individual captive Atlantic cod (Gadus morhua) Peer reviewed Kjesbu, Olav Sigurd Solemdal, Per Bratland, Per Fonn, Merete 1996 292571 bytes application/pdf http://hdl.handle.net/11250/109284 https://doi.org/10.1139/f95-215 eng eng urn:issn:0706-652X http://hdl.handle.net/11250/109284 http://dx.doi.org/10.1139/f95-215 610-620 53 Canadian Journal of Fisheries and Aquatic Sciences 3 haddock hyse cod torsk egg production eggproduksjon Journal article 1996 ftimr https://doi.org/10.1139/f95-215 2021-09-23T20:15:43Z Variability in the annual egg production of hatchery-reared Atlantic cod (Gadus morhua) was determined under stable experimental conditions. Egg size increased with fish age as an approximate step function. Comparing first- and second-time spawners, the variance in egg dry weight was 32% within individuals (i.e., the seasonal effect, the cod being a multiple-batch spawner), 55% between years, and 12% between individuals. In several repeat spawners, the curvature of the seasonal egg size curves showed little difference between years. The seasonal decrease in egg size was typically smaller in recruit spawners than in repeat spawners. There was no empirical evidence to suggest that environmental temperature regulates seasonal variations in egg size. The extent of egg swelling (i.e., the egg dry weight/diameter ratio) indicated a strong genetic component. Investment in ovarian growth was influenced by previous allocations as exemplified by annual, sinusoidal fecundity oscillations. Larger fish showed significantly longer spawning periods. The combined influence of maternal factors and the annual temperature variations noticed in the field during early stages suggests that larger larvae at the onset of feeding are more likely to survive. Article in Journal/Newspaper atlantic cod Gadus morhua Institute for Marine Research: Brage IMR Canadian Journal of Fisheries and Aquatic Sciences 53 3 610 620 |
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Open Polar |
collection |
Institute for Marine Research: Brage IMR |
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ftimr |
language |
English |
topic |
haddock hyse cod torsk egg production eggproduksjon |
spellingShingle |
haddock hyse cod torsk egg production eggproduksjon Kjesbu, Olav Sigurd Solemdal, Per Bratland, Per Fonn, Merete Variation in annual egg production in individual captive Atlantic cod (Gadus morhua) |
topic_facet |
haddock hyse cod torsk egg production eggproduksjon |
description |
Variability in the annual egg production of hatchery-reared Atlantic cod (Gadus morhua) was determined under stable experimental conditions. Egg size increased with fish age as an approximate step function. Comparing first- and second-time spawners, the variance in egg dry weight was 32% within individuals (i.e., the seasonal effect, the cod being a multiple-batch spawner), 55% between years, and 12% between individuals. In several repeat spawners, the curvature of the seasonal egg size curves showed little difference between years. The seasonal decrease in egg size was typically smaller in recruit spawners than in repeat spawners. There was no empirical evidence to suggest that environmental temperature regulates seasonal variations in egg size. The extent of egg swelling (i.e., the egg dry weight/diameter ratio) indicated a strong genetic component. Investment in ovarian growth was influenced by previous allocations as exemplified by annual, sinusoidal fecundity oscillations. Larger fish showed significantly longer spawning periods. The combined influence of maternal factors and the annual temperature variations noticed in the field during early stages suggests that larger larvae at the onset of feeding are more likely to survive. |
format |
Article in Journal/Newspaper |
author |
Kjesbu, Olav Sigurd Solemdal, Per Bratland, Per Fonn, Merete |
author_facet |
Kjesbu, Olav Sigurd Solemdal, Per Bratland, Per Fonn, Merete |
author_sort |
Kjesbu, Olav Sigurd |
title |
Variation in annual egg production in individual captive Atlantic cod (Gadus morhua) |
title_short |
Variation in annual egg production in individual captive Atlantic cod (Gadus morhua) |
title_full |
Variation in annual egg production in individual captive Atlantic cod (Gadus morhua) |
title_fullStr |
Variation in annual egg production in individual captive Atlantic cod (Gadus morhua) |
title_full_unstemmed |
Variation in annual egg production in individual captive Atlantic cod (Gadus morhua) |
title_sort |
variation in annual egg production in individual captive atlantic cod (gadus morhua) |
publishDate |
1996 |
url |
http://hdl.handle.net/11250/109284 https://doi.org/10.1139/f95-215 |
genre |
atlantic cod Gadus morhua |
genre_facet |
atlantic cod Gadus morhua |
op_source |
610-620 53 Canadian Journal of Fisheries and Aquatic Sciences 3 |
op_relation |
urn:issn:0706-652X http://hdl.handle.net/11250/109284 http://dx.doi.org/10.1139/f95-215 |
op_doi |
https://doi.org/10.1139/f95-215 |
container_title |
Canadian Journal of Fisheries and Aquatic Sciences |
container_volume |
53 |
container_issue |
3 |
container_start_page |
610 |
op_container_end_page |
620 |
_version_ |
1766357638568738816 |