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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Online Access: | http://hdl.handle.net/10508/879 http://hdl.handle.net/10261/329033 https://doi.org/10.2960/J.v25.a2 |
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ftcsic:oai:digital.csic.es:10261/329033 2024-02-11T10:04:16+01:00 Changes in Greenland Halibut Growth, Condition and Fecundity in the Northwest Atlantic (Flemish Pass, Flemish Cap and Southern Grand Bank) Junquera, Susana Román-Marcote, Esther Paz, Xabier Ramilo-Rivero, Guadalupe Atlantic Ocean North Atlantic Northwest Atlantic Flemish Cap 1999 http://hdl.handle.net/10508/879 http://hdl.handle.net/10261/329033 https://doi.org/10.2960/J.v25.a2 en eng Centro Oceanográfico de Vigo https://doi.org/10.2960/J.v25.a2 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 0250-6408 http://hdl.handle.net/10508/879 http://hdl.handle.net/10261/329033 doi:10.2960/J.v25.a2 3935 open Pesquerías Centro Oceanográfico de Vigo fecundity Flemish Cap Greenland halibut Grand Bank growth artículo http://purl.org/coar/resource_type/c_6501 1999 ftcsic https://doi.org/10.2960/J.v25.a2 2024-01-16T11:49:38Z 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 Digital.CSIC (Spanish National Research Council) Greenland Journal of Northwest Atlantic Fishery Science 25 17 28 |
institution |
Open Polar |
collection |
Digital.CSIC (Spanish National Research Council) |
op_collection_id |
ftcsic |
language |
English |
topic |
Pesquerías Centro Oceanográfico de Vigo fecundity Flemish Cap Greenland halibut Grand Bank growth |
spellingShingle |
Pesquerías Centro Oceanográfico de Vigo fecundity Flemish Cap Greenland halibut Grand Bank growth Junquera, Susana Román-Marcote, Esther Paz, Xabier Ramilo-Rivero, Guadalupe Changes in Greenland Halibut Growth, Condition and Fecundity in the Northwest Atlantic (Flemish Pass, Flemish Cap and Southern Grand Bank) |
topic_facet |
Pesquerías Centro Oceanográfico de Vigo 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, Susana Román-Marcote, Esther Paz, Xabier Ramilo-Rivero, Guadalupe |
author_facet |
Junquera, Susana Román-Marcote, Esther Paz, Xabier Ramilo-Rivero, Guadalupe |
author_sort |
Junquera, 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) |
publishDate |
1999 |
url |
http://hdl.handle.net/10508/879 http://hdl.handle.net/10261/329033 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 |
Centro Oceanográfico de Vigo https://doi.org/10.2960/J.v25.a2 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 0250-6408 http://hdl.handle.net/10508/879 http://hdl.handle.net/10261/329033 doi:10.2960/J.v25.a2 3935 |
op_rights |
open |
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_ |
1790600842323165184 |