Why the Atlantic cod ( Gadus morhua ) stock off eastern Nova Scotia has not recovered
An age-structured population dynamics model, incorporating interactions between Atlantic cod (Gadus morhua), the fishery, and the grey seal (Halichoerus grypus) population, was applied to the cod stock off eastern Nova Scotia (Northwest Atlantic Fisheries Organization Divisions 4Vs and 4W, commonly...
Published in: | Canadian Journal of Fisheries and Aquatic Sciences |
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2001
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Online Access: | http://dx.doi.org/10.1139/f01-095 http://www.nrcresearchpress.com/doi/pdf/10.1139/f01-095 |
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crcansciencepubl:10.1139/f01-095 2024-05-12T08:00:55+00:00 Why the Atlantic cod ( Gadus morhua ) stock off eastern Nova Scotia has not recovered Fu, Caihong Mohn, Robert Fanning, L Paul 2001 http://dx.doi.org/10.1139/f01-095 http://www.nrcresearchpress.com/doi/pdf/10.1139/f01-095 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Fisheries and Aquatic Sciences volume 58, issue 8, page 1613-1623 ISSN 0706-652X 1205-7533 Aquatic Science Ecology, Evolution, Behavior and Systematics journal-article 2001 crcansciencepubl https://doi.org/10.1139/f01-095 2024-04-18T06:54:54Z An age-structured population dynamics model, incorporating interactions between Atlantic cod (Gadus morhua), the fishery, and the grey seal (Halichoerus grypus) population, was applied to the cod stock off eastern Nova Scotia (Northwest Atlantic Fisheries Organization Divisions 4Vs and 4W, commonly abbreviated to 4VsW), a stock that has dramatically declined since the late 1980s. Mortality was modeled as having three components: fishing mortality (F), seal predation (M p ), and all other sources of natural mortality (M). Specifically, M was assumed to be distinct for immature cod (ages 14; M i ) and mature cod (age 5 and older; M m ), and respective annual variations were estimated. Parameters estimated also included recruitment (cod abundance at age 1; R), F, and M p . Based on our estimates of F, M p , and M, it is unlikely that the collapse of the 4VsW cod stock can be attributed to a sudden increase in M; fishing appears to have been the primary cause for the stock's decline. However, after the moratorium on commercial fishing in 1993, increasing M p and M m and low R may have contributed to the failure of the 4VsW cod stock to recover. Article in Journal/Newspaper atlantic cod Gadus morhua Northwest Atlantic Canadian Science Publishing Canadian Journal of Fisheries and Aquatic Sciences 58 8 1613 1623 |
institution |
Open Polar |
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Canadian Science Publishing |
op_collection_id |
crcansciencepubl |
language |
English |
topic |
Aquatic Science Ecology, Evolution, Behavior and Systematics |
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Aquatic Science Ecology, Evolution, Behavior and Systematics Fu, Caihong Mohn, Robert Fanning, L Paul Why the Atlantic cod ( Gadus morhua ) stock off eastern Nova Scotia has not recovered |
topic_facet |
Aquatic Science Ecology, Evolution, Behavior and Systematics |
description |
An age-structured population dynamics model, incorporating interactions between Atlantic cod (Gadus morhua), the fishery, and the grey seal (Halichoerus grypus) population, was applied to the cod stock off eastern Nova Scotia (Northwest Atlantic Fisheries Organization Divisions 4Vs and 4W, commonly abbreviated to 4VsW), a stock that has dramatically declined since the late 1980s. Mortality was modeled as having three components: fishing mortality (F), seal predation (M p ), and all other sources of natural mortality (M). Specifically, M was assumed to be distinct for immature cod (ages 14; M i ) and mature cod (age 5 and older; M m ), and respective annual variations were estimated. Parameters estimated also included recruitment (cod abundance at age 1; R), F, and M p . Based on our estimates of F, M p , and M, it is unlikely that the collapse of the 4VsW cod stock can be attributed to a sudden increase in M; fishing appears to have been the primary cause for the stock's decline. However, after the moratorium on commercial fishing in 1993, increasing M p and M m and low R may have contributed to the failure of the 4VsW cod stock to recover. |
format |
Article in Journal/Newspaper |
author |
Fu, Caihong Mohn, Robert Fanning, L Paul |
author_facet |
Fu, Caihong Mohn, Robert Fanning, L Paul |
author_sort |
Fu, Caihong |
title |
Why the Atlantic cod ( Gadus morhua ) stock off eastern Nova Scotia has not recovered |
title_short |
Why the Atlantic cod ( Gadus morhua ) stock off eastern Nova Scotia has not recovered |
title_full |
Why the Atlantic cod ( Gadus morhua ) stock off eastern Nova Scotia has not recovered |
title_fullStr |
Why the Atlantic cod ( Gadus morhua ) stock off eastern Nova Scotia has not recovered |
title_full_unstemmed |
Why the Atlantic cod ( Gadus morhua ) stock off eastern Nova Scotia has not recovered |
title_sort |
why the atlantic cod ( gadus morhua ) stock off eastern nova scotia has not recovered |
publisher |
Canadian Science Publishing |
publishDate |
2001 |
url |
http://dx.doi.org/10.1139/f01-095 http://www.nrcresearchpress.com/doi/pdf/10.1139/f01-095 |
genre |
atlantic cod Gadus morhua Northwest Atlantic |
genre_facet |
atlantic cod Gadus morhua Northwest Atlantic |
op_source |
Canadian Journal of Fisheries and Aquatic Sciences volume 58, issue 8, page 1613-1623 ISSN 0706-652X 1205-7533 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/f01-095 |
container_title |
Canadian Journal of Fisheries and Aquatic Sciences |
container_volume |
58 |
container_issue |
8 |
container_start_page |
1613 |
op_container_end_page |
1623 |
_version_ |
1798842982800031744 |