Mechanisms regulating oocyte recruitment and skippedspawning in Northeast Arctic cod (Gadus morhua L.)
Journal homepage: http://pubs.nrc-cnrc.gc.ca/rp-ps/journalDetail.jsp?jcode=cjfas&lang=eng To examine mechanisms that affect fecundity, atresia and skipped spawning in Northeast Arctic cod (Gadus morhua L.), we conducted an experiment where wild-caught cod (>60 cm) kept under restricted food r...
Published in: | Canadian Journal of Fisheries and Aquatic Sciences |
---|---|
Main Authors: | , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
NRC Research Press
2009
|
Subjects: | |
Online Access: | http://hdl.handle.net/11250/117125 https://doi.org/10.1139/F09-102 |
id |
ftimr:oai:imr.brage.unit.no:11250/117125 |
---|---|
record_format |
openpolar |
spelling |
ftimr:oai:imr.brage.unit.no:11250/117125 2023-05-15T14:30:22+02:00 Mechanisms regulating oocyte recruitment and skippedspawning in Northeast Arctic cod (Gadus morhua L.) Skjæraasen, Jon Egil Kennedy, James Thorsen, Anders Fonn, Merete Strand, Bente Mayer, Ian Kjesbu, Olav Sigurd 2009-09 application/pdf http://hdl.handle.net/11250/117125 https://doi.org/10.1139/F09-102 eng eng NRC Research Press urn:issn:1205-7533 http://hdl.handle.net/11250/117125 http://dx.doi.org/10.1139/F09-102 1582-1596 66 Canadian Journal of Fisheries and Aquatic Sciences 9 spawning gyting stock enhancement bestandsstyrking egg production eggproduksjon arctic cod arktisk torsk VDP::Agriculture and fishery disciplines: 900::Agriculture disciplines: 910::Livestock breeding rearing reproduction: 912 VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Fish health: 923 Journal article Peer reviewed 2009 ftimr https://doi.org/10.1139/F09-102 2021-09-23T20:15:48Z Journal homepage: http://pubs.nrc-cnrc.gc.ca/rp-ps/journalDetail.jsp?jcode=cjfas&lang=eng To examine mechanisms that affect fecundity, atresia and skipped spawning in Northeast Arctic cod (Gadus morhua L.), we conducted an experiment where wild-caught cod (>60 cm) kept under restricted food regimes were subjected to monthly biopsies, hormonal and physical measurements. The power of body weight as a fecundity proxy increased until the presumed end of follicle proliferation in early November, thereafter it remained stable. Atresia occurred in most females; but, for maturing females, mainly close to spawning. 18 % of the females had small gonads with predominantly previtellogenic oocytes at sacrifice in January. These females were past-spawners, verified by post ovulatory follicles in their gonadss. These „skippers‟ had lower condition than maturing cod from December, smaller livers upon sacrifice and lower plasma 17-β estradiol values from early November. Until November, oocytes developed similarly for all females, but in November oocyte development was arrested at the early cortical alveoli stage and atresia occurred in all skippers. In sum, fecundity and skipped spawning seem highly influenced by energy reserves during early vitellogenesis and limited to females only. Finally, skippers were identifiable long before the predicted onset of spawning, which could have implications for forecasting of egg production and hence stock-recruitment relationships. Article in Journal/Newspaper Arctic cod Arctic Arktis* Gadus morhua Northeast Arctic cod Institute for Marine Research: Brage IMR Arctic Canadian Journal of Fisheries and Aquatic Sciences 66 9 1582 1596 |
institution |
Open Polar |
collection |
Institute for Marine Research: Brage IMR |
op_collection_id |
ftimr |
language |
English |
topic |
spawning gyting stock enhancement bestandsstyrking egg production eggproduksjon arctic cod arktisk torsk VDP::Agriculture and fishery disciplines: 900::Agriculture disciplines: 910::Livestock breeding rearing reproduction: 912 VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Fish health: 923 |
spellingShingle |
spawning gyting stock enhancement bestandsstyrking egg production eggproduksjon arctic cod arktisk torsk VDP::Agriculture and fishery disciplines: 900::Agriculture disciplines: 910::Livestock breeding rearing reproduction: 912 VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Fish health: 923 Skjæraasen, Jon Egil Kennedy, James Thorsen, Anders Fonn, Merete Strand, Bente Mayer, Ian Kjesbu, Olav Sigurd Mechanisms regulating oocyte recruitment and skippedspawning in Northeast Arctic cod (Gadus morhua L.) |
topic_facet |
spawning gyting stock enhancement bestandsstyrking egg production eggproduksjon arctic cod arktisk torsk VDP::Agriculture and fishery disciplines: 900::Agriculture disciplines: 910::Livestock breeding rearing reproduction: 912 VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Fish health: 923 |
description |
Journal homepage: http://pubs.nrc-cnrc.gc.ca/rp-ps/journalDetail.jsp?jcode=cjfas&lang=eng To examine mechanisms that affect fecundity, atresia and skipped spawning in Northeast Arctic cod (Gadus morhua L.), we conducted an experiment where wild-caught cod (>60 cm) kept under restricted food regimes were subjected to monthly biopsies, hormonal and physical measurements. The power of body weight as a fecundity proxy increased until the presumed end of follicle proliferation in early November, thereafter it remained stable. Atresia occurred in most females; but, for maturing females, mainly close to spawning. 18 % of the females had small gonads with predominantly previtellogenic oocytes at sacrifice in January. These females were past-spawners, verified by post ovulatory follicles in their gonadss. These „skippers‟ had lower condition than maturing cod from December, smaller livers upon sacrifice and lower plasma 17-β estradiol values from early November. Until November, oocytes developed similarly for all females, but in November oocyte development was arrested at the early cortical alveoli stage and atresia occurred in all skippers. In sum, fecundity and skipped spawning seem highly influenced by energy reserves during early vitellogenesis and limited to females only. Finally, skippers were identifiable long before the predicted onset of spawning, which could have implications for forecasting of egg production and hence stock-recruitment relationships. |
format |
Article in Journal/Newspaper |
author |
Skjæraasen, Jon Egil Kennedy, James Thorsen, Anders Fonn, Merete Strand, Bente Mayer, Ian Kjesbu, Olav Sigurd |
author_facet |
Skjæraasen, Jon Egil Kennedy, James Thorsen, Anders Fonn, Merete Strand, Bente Mayer, Ian Kjesbu, Olav Sigurd |
author_sort |
Skjæraasen, Jon Egil |
title |
Mechanisms regulating oocyte recruitment and skippedspawning in Northeast Arctic cod (Gadus morhua L.) |
title_short |
Mechanisms regulating oocyte recruitment and skippedspawning in Northeast Arctic cod (Gadus morhua L.) |
title_full |
Mechanisms regulating oocyte recruitment and skippedspawning in Northeast Arctic cod (Gadus morhua L.) |
title_fullStr |
Mechanisms regulating oocyte recruitment and skippedspawning in Northeast Arctic cod (Gadus morhua L.) |
title_full_unstemmed |
Mechanisms regulating oocyte recruitment and skippedspawning in Northeast Arctic cod (Gadus morhua L.) |
title_sort |
mechanisms regulating oocyte recruitment and skippedspawning in northeast arctic cod (gadus morhua l.) |
publisher |
NRC Research Press |
publishDate |
2009 |
url |
http://hdl.handle.net/11250/117125 https://doi.org/10.1139/F09-102 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic cod Arctic Arktis* Gadus morhua Northeast Arctic cod |
genre_facet |
Arctic cod Arctic Arktis* Gadus morhua Northeast Arctic cod |
op_source |
1582-1596 66 Canadian Journal of Fisheries and Aquatic Sciences 9 |
op_relation |
urn:issn:1205-7533 http://hdl.handle.net/11250/117125 http://dx.doi.org/10.1139/F09-102 |
op_doi |
https://doi.org/10.1139/F09-102 |
container_title |
Canadian Journal of Fisheries and Aquatic Sciences |
container_volume |
66 |
container_issue |
9 |
container_start_page |
1582 |
op_container_end_page |
1596 |
_version_ |
1766304225118126080 |