Changes in Greenland Halibut Growth, Condition and Fecundity in the Northwest Atlantic (Flemish Pass, Flemish Cap and Southern Grand Bank)
The Greenland halibut fishable stock has been declining substantially since late-1980s, according to both surveys and commercial fishery indices, particularly among the ages 10+, which corresponds to the females age at 50% maturity. In this paper the effect of this apparent reduction in the stock ab...
Published in: | Journal of Northwest Atlantic Fishery Science |
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Centro Oceanográfico de Vigo
1999
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Online Access: | http://hdl.handle.net/10508/879 https://doi.org/10.2960/J.v25.a2 |
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ftieo:oai:repositorio.ieo.es:10508/879 2023-05-15T16:27:23+02:00 Changes in Greenland Halibut Growth, Condition and Fecundity in the Northwest Atlantic (Flemish Pass, Flemish Cap and Southern Grand Bank) Junquera, S. (Susana) Román-Marcote, E. (Esther) Paz, X. (Xabier) Ramilo-Rivero, G. (Guadalupe) Atlantic Ocean North Atlantic Northwest Atlantic Flemish Cap 1999 http://hdl.handle.net/10508/879 https://doi.org/10.2960/J.v25.a2 eng eng Centro Oceanográfico de Vigo https://doi.org/10.2960/J.v25.a2 0250-6408 http://hdl.handle.net/10508/879 Junquera, S. et al. 1999.Changes in Greenland Halibut Growth, Condition and Fecundity in the Northwest Atlantic (Flemish Pass, Flemish Cap and Southern Grand Bank). J. Northw Atl. Fish. Sci., 25: 17-28 doi:10.2960/J.v25.a2 Atribución-NoComercial-SinDerivadas 3.0 España http://creativecommons.org/licenses/by-nc-nd/3.0/es/ fecundity Flemish Cap Greenland halibut Grand Bank growth research article 1999 ftieo https://doi.org/10.2960/J.v25.a2 2023-03-15T00:56:10Z The Greenland halibut fishable stock has been declining substantially since late-1980s, according to both surveys and commercial fishery indices, particularly among the ages 10+, which corresponds to the females age at 50% maturity. In this paper the effect of this apparent reduction in the stock abundance on growth and reproductive parameters is examined. Among growth parameters, the analysis of the first year growth is undertaken both by cohort and by geographic areas, assuming that density dependence might be the most severe at younger age classes. This is made using records of the respective first annual ring otolith diameters. Other growth related index such as the condition factor is also analysed. Neither significant differences in the first year growth have been observed between areas analysed, nor between cohorts, during the period 1988 to 1996. Mean condition factor-at-age for ages 1 to 13 were stable during this same period. About the reproductive parameters, two aspects are considered: the interannual variations in length-at-maturity and in the potential fecundity. Female length at maturity varied between 64.5 and 69.5 cm. Female potential annual fecundity ranged between 15 000 and 158 000. It increases with female age, but the mean fecundity-at-age variations were not significant either between years of sampling or between cohorts. A common feature observed is the relative stability of those characteristic through the period analysed, which could support a certain resiliency of the life history traits in this species. Article in Journal/Newspaper Greenland North Atlantic Northwest Atlantic Instituto Español de Oceanografía: e-IEO Greenland Journal of Northwest Atlantic Fishery Science 25 17 28 |
institution |
Open Polar |
collection |
Instituto Español de Oceanografía: e-IEO |
op_collection_id |
ftieo |
language |
English |
topic |
fecundity Flemish Cap Greenland halibut Grand Bank growth |
spellingShingle |
fecundity Flemish Cap Greenland halibut Grand Bank growth Junquera, S. (Susana) Román-Marcote, E. (Esther) Paz, X. (Xabier) Ramilo-Rivero, G. (Guadalupe) Changes in Greenland Halibut Growth, Condition and Fecundity in the Northwest Atlantic (Flemish Pass, Flemish Cap and Southern Grand Bank) |
topic_facet |
fecundity Flemish Cap Greenland halibut Grand Bank growth |
description |
The Greenland halibut fishable stock has been declining substantially since late-1980s, according to both surveys and commercial fishery indices, particularly among the ages 10+, which corresponds to the females age at 50% maturity. In this paper the effect of this apparent reduction in the stock abundance on growth and reproductive parameters is examined. Among growth parameters, the analysis of the first year growth is undertaken both by cohort and by geographic areas, assuming that density dependence might be the most severe at younger age classes. This is made using records of the respective first annual ring otolith diameters. Other growth related index such as the condition factor is also analysed. Neither significant differences in the first year growth have been observed between areas analysed, nor between cohorts, during the period 1988 to 1996. Mean condition factor-at-age for ages 1 to 13 were stable during this same period. About the reproductive parameters, two aspects are considered: the interannual variations in length-at-maturity and in the potential fecundity. Female length at maturity varied between 64.5 and 69.5 cm. Female potential annual fecundity ranged between 15 000 and 158 000. It increases with female age, but the mean fecundity-at-age variations were not significant either between years of sampling or between cohorts. A common feature observed is the relative stability of those characteristic through the period analysed, which could support a certain resiliency of the life history traits in this species. |
format |
Article in Journal/Newspaper |
author |
Junquera, S. (Susana) Román-Marcote, E. (Esther) Paz, X. (Xabier) Ramilo-Rivero, G. (Guadalupe) |
author_facet |
Junquera, S. (Susana) Román-Marcote, E. (Esther) Paz, X. (Xabier) Ramilo-Rivero, G. (Guadalupe) |
author_sort |
Junquera, S. (Susana) |
title |
Changes in Greenland Halibut Growth, Condition and Fecundity in the Northwest Atlantic (Flemish Pass, Flemish Cap and Southern Grand Bank) |
title_short |
Changes in Greenland Halibut Growth, Condition and Fecundity in the Northwest Atlantic (Flemish Pass, Flemish Cap and Southern Grand Bank) |
title_full |
Changes in Greenland Halibut Growth, Condition and Fecundity in the Northwest Atlantic (Flemish Pass, Flemish Cap and Southern Grand Bank) |
title_fullStr |
Changes in Greenland Halibut Growth, Condition and Fecundity in the Northwest Atlantic (Flemish Pass, Flemish Cap and Southern Grand Bank) |
title_full_unstemmed |
Changes in Greenland Halibut Growth, Condition and Fecundity in the Northwest Atlantic (Flemish Pass, Flemish Cap and Southern Grand Bank) |
title_sort |
changes in greenland halibut growth, condition and fecundity in the northwest atlantic (flemish pass, flemish cap and southern grand bank) |
publisher |
Centro Oceanográfico de Vigo |
publishDate |
1999 |
url |
http://hdl.handle.net/10508/879 https://doi.org/10.2960/J.v25.a2 |
op_coverage |
Atlantic Ocean North Atlantic Northwest Atlantic Flemish Cap |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland North Atlantic Northwest Atlantic |
genre_facet |
Greenland North Atlantic Northwest Atlantic |
op_relation |
https://doi.org/10.2960/J.v25.a2 0250-6408 http://hdl.handle.net/10508/879 Junquera, S. et al. 1999.Changes in Greenland Halibut Growth, Condition and Fecundity in the Northwest Atlantic (Flemish Pass, Flemish Cap and Southern Grand Bank). J. Northw Atl. Fish. Sci., 25: 17-28 doi:10.2960/J.v25.a2 |
op_rights |
Atribución-NoComercial-SinDerivadas 3.0 España http://creativecommons.org/licenses/by-nc-nd/3.0/es/ |
op_doi |
https://doi.org/10.2960/J.v25.a2 |
container_title |
Journal of Northwest Atlantic Fishery Science |
container_volume |
25 |
container_start_page |
17 |
op_container_end_page |
28 |
_version_ |
1766016533349269504 |