Systematic bias in estimates of reproductive potential of an Atlantic cod ( Gadus morhua ) stock: implications for stockrecruit theory and management
Stockrecruit relationships that use spawning stock biomass (SSB) to represent reproductive potential assume that the proportion of SSB composed of females and the relative fecundity (number of eggs produced per unit mass) are both constant over time. To test these two assumptions, female-only spawn...
Published in: | Canadian Journal of Fisheries and Aquatic Sciences |
---|---|
Main Authors: | , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Canadian Science Publishing
2006
|
Subjects: | |
Online Access: | http://dx.doi.org/10.1139/f05-270 http://www.nrcresearchpress.com/doi/pdf/10.1139/f05-270 |
id |
crcansciencepubl:10.1139/f05-270 |
---|---|
record_format |
openpolar |
spelling |
crcansciencepubl:10.1139/f05-270 2024-04-28T08:11:02+00:00 Systematic bias in estimates of reproductive potential of an Atlantic cod ( Gadus morhua ) stock: implications for stockrecruit theory and management Marshall, C Tara Needle, Coby L Thorsen, Anders Kjesbu, Olav Sigurd Yaragina, Nathalia A 2006 http://dx.doi.org/10.1139/f05-270 http://www.nrcresearchpress.com/doi/pdf/10.1139/f05-270 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Fisheries and Aquatic Sciences volume 63, issue 5, page 980-994 ISSN 0706-652X 1205-7533 Aquatic Science Ecology, Evolution, Behavior and Systematics journal-article 2006 crcansciencepubl https://doi.org/10.1139/f05-270 2024-04-02T06:55:52Z Stockrecruit relationships that use spawning stock biomass (SSB) to represent reproductive potential assume that the proportion of SSB composed of females and the relative fecundity (number of eggs produced per unit mass) are both constant over time. To test these two assumptions, female-only spawner biomass (FSB) and total egg production (TEP) were estimated for the Northeast Arctic stock of Atlantic cod (Gadus morhua) over a 56-year time period. The proportion of females (FSB/SSB) varied between 24% and 68%, and the variation was systematic with length such that SSB became more female-biased as the mean length of spawners increased. Relative fecundity of the stock (TEP/SSB) varied between 115 and 355 eggs·g 1 and was significantly, positively correlated with mean length of spawners. Both FSB and TEP gave a different interpretation of the recruitment response to reductions in stock size (overcompensatory) compared with that obtained using SSB (either compensatory or depensatory). There was no difference between SSB and FSB in the assessment of stock status; however, in recent years (19802001) TEP fell below the threshold level at which recruitment becomes impaired more frequently than did SSB. This suggests that using SSB as a measure of stock reproductive potential could lead to overly optimistic assessments of stock status. Article in Journal/Newspaper Arctic atlantic cod Gadus morhua Canadian Science Publishing Canadian Journal of Fisheries and Aquatic Sciences 63 5 980 994 |
institution |
Open Polar |
collection |
Canadian Science Publishing |
op_collection_id |
crcansciencepubl |
language |
English |
topic |
Aquatic Science Ecology, Evolution, Behavior and Systematics |
spellingShingle |
Aquatic Science Ecology, Evolution, Behavior and Systematics Marshall, C Tara Needle, Coby L Thorsen, Anders Kjesbu, Olav Sigurd Yaragina, Nathalia A Systematic bias in estimates of reproductive potential of an Atlantic cod ( Gadus morhua ) stock: implications for stockrecruit theory and management |
topic_facet |
Aquatic Science Ecology, Evolution, Behavior and Systematics |
description |
Stockrecruit relationships that use spawning stock biomass (SSB) to represent reproductive potential assume that the proportion of SSB composed of females and the relative fecundity (number of eggs produced per unit mass) are both constant over time. To test these two assumptions, female-only spawner biomass (FSB) and total egg production (TEP) were estimated for the Northeast Arctic stock of Atlantic cod (Gadus morhua) over a 56-year time period. The proportion of females (FSB/SSB) varied between 24% and 68%, and the variation was systematic with length such that SSB became more female-biased as the mean length of spawners increased. Relative fecundity of the stock (TEP/SSB) varied between 115 and 355 eggs·g 1 and was significantly, positively correlated with mean length of spawners. Both FSB and TEP gave a different interpretation of the recruitment response to reductions in stock size (overcompensatory) compared with that obtained using SSB (either compensatory or depensatory). There was no difference between SSB and FSB in the assessment of stock status; however, in recent years (19802001) TEP fell below the threshold level at which recruitment becomes impaired more frequently than did SSB. This suggests that using SSB as a measure of stock reproductive potential could lead to overly optimistic assessments of stock status. |
format |
Article in Journal/Newspaper |
author |
Marshall, C Tara Needle, Coby L Thorsen, Anders Kjesbu, Olav Sigurd Yaragina, Nathalia A |
author_facet |
Marshall, C Tara Needle, Coby L Thorsen, Anders Kjesbu, Olav Sigurd Yaragina, Nathalia A |
author_sort |
Marshall, C Tara |
title |
Systematic bias in estimates of reproductive potential of an Atlantic cod ( Gadus morhua ) stock: implications for stockrecruit theory and management |
title_short |
Systematic bias in estimates of reproductive potential of an Atlantic cod ( Gadus morhua ) stock: implications for stockrecruit theory and management |
title_full |
Systematic bias in estimates of reproductive potential of an Atlantic cod ( Gadus morhua ) stock: implications for stockrecruit theory and management |
title_fullStr |
Systematic bias in estimates of reproductive potential of an Atlantic cod ( Gadus morhua ) stock: implications for stockrecruit theory and management |
title_full_unstemmed |
Systematic bias in estimates of reproductive potential of an Atlantic cod ( Gadus morhua ) stock: implications for stockrecruit theory and management |
title_sort |
systematic bias in estimates of reproductive potential of an atlantic cod ( gadus morhua ) stock: implications for stockrecruit theory and management |
publisher |
Canadian Science Publishing |
publishDate |
2006 |
url |
http://dx.doi.org/10.1139/f05-270 http://www.nrcresearchpress.com/doi/pdf/10.1139/f05-270 |
genre |
Arctic atlantic cod Gadus morhua |
genre_facet |
Arctic atlantic cod Gadus morhua |
op_source |
Canadian Journal of Fisheries and Aquatic Sciences volume 63, issue 5, page 980-994 ISSN 0706-652X 1205-7533 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/f05-270 |
container_title |
Canadian Journal of Fisheries and Aquatic Sciences |
container_volume |
63 |
container_issue |
5 |
container_start_page |
980 |
op_container_end_page |
994 |
_version_ |
1797578645021130752 |