Histological assessment of variations in sexual maturity of cod (Gadus morhua L.) at the Flemish Cap (north-west Atlantic)
A histological method is used to detect the proportion of both adult and recruit females at the beginning of gonad development, in summer, a few months after spawning. At this time it is difficult to make a visual diagnosis of the sexual maturity stage. The proportion of females with postovulatory f...
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Oxford University Press
1998
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fthighwire:oai:open-archive.highwire.org:icesjms:55/3/515 2023-05-15T16:19:11+02:00 Histological assessment of variations in sexual maturity of cod (Gadus morhua L.) at the Flemish Cap (north-west Atlantic) Saborido-Rey, Fran Junquera, Susana 1998-06-01 00:00:00.0 text/html http://icesjms.oxfordjournals.org/cgi/content/short/55/3/515 https://doi.org/10.1006/jmsc.1997.0344 en eng Oxford University Press http://icesjms.oxfordjournals.org/cgi/content/short/55/3/515 http://dx.doi.org/10.1006/jmsc.1997.0344 Copyright (C) 1998, International Council for the Exploration of the Sea/Conseil International pour l'Exploration de la Mer Articles TEXT 1998 fthighwire https://doi.org/10.1006/jmsc.1997.0344 2013-05-27T06:02:50Z A histological method is used to detect the proportion of both adult and recruit females at the beginning of gonad development, in summer, a few months after spawning. At this time it is difficult to make a visual diagnosis of the sexual maturity stage. The proportion of females with postovulatory follicles is used to determine the length and age at maturity in the year of sampling, and the proportion of females in the cortical alveoli and/or vitellogenic stages is used to estimate the same parameter for the following year. Variations in age and length at maturity during the period 1992–1995 were analysed by comparing the respective maturity curves of both the “previous spawners” and the “next-year spawners” females. A drastic decrease in both the age and the length at maturity is observed in this period and it seems likely that the age at maturity of female cod became fixed at around age 3 at the end of the period analysed. The possibility that this could be a density-dependent response of the stock at the Flemish Cap is discussed. Text Gadus morhua North West Atlantic HighWire Press (Stanford University) ICES Journal of Marine Science 55 3 515 521 |
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HighWire Press (Stanford University) |
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English |
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Articles Saborido-Rey, Fran Junquera, Susana Histological assessment of variations in sexual maturity of cod (Gadus morhua L.) at the Flemish Cap (north-west Atlantic) |
topic_facet |
Articles |
description |
A histological method is used to detect the proportion of both adult and recruit females at the beginning of gonad development, in summer, a few months after spawning. At this time it is difficult to make a visual diagnosis of the sexual maturity stage. The proportion of females with postovulatory follicles is used to determine the length and age at maturity in the year of sampling, and the proportion of females in the cortical alveoli and/or vitellogenic stages is used to estimate the same parameter for the following year. Variations in age and length at maturity during the period 1992–1995 were analysed by comparing the respective maturity curves of both the “previous spawners” and the “next-year spawners” females. A drastic decrease in both the age and the length at maturity is observed in this period and it seems likely that the age at maturity of female cod became fixed at around age 3 at the end of the period analysed. The possibility that this could be a density-dependent response of the stock at the Flemish Cap is discussed. |
format |
Text |
author |
Saborido-Rey, Fran Junquera, Susana |
author_facet |
Saborido-Rey, Fran Junquera, Susana |
author_sort |
Saborido-Rey, Fran |
title |
Histological assessment of variations in sexual maturity of cod (Gadus morhua L.) at the Flemish Cap (north-west Atlantic) |
title_short |
Histological assessment of variations in sexual maturity of cod (Gadus morhua L.) at the Flemish Cap (north-west Atlantic) |
title_full |
Histological assessment of variations in sexual maturity of cod (Gadus morhua L.) at the Flemish Cap (north-west Atlantic) |
title_fullStr |
Histological assessment of variations in sexual maturity of cod (Gadus morhua L.) at the Flemish Cap (north-west Atlantic) |
title_full_unstemmed |
Histological assessment of variations in sexual maturity of cod (Gadus morhua L.) at the Flemish Cap (north-west Atlantic) |
title_sort |
histological assessment of variations in sexual maturity of cod (gadus morhua l.) at the flemish cap (north-west atlantic) |
publisher |
Oxford University Press |
publishDate |
1998 |
url |
http://icesjms.oxfordjournals.org/cgi/content/short/55/3/515 https://doi.org/10.1006/jmsc.1997.0344 |
genre |
Gadus morhua North West Atlantic |
genre_facet |
Gadus morhua North West Atlantic |
op_relation |
http://icesjms.oxfordjournals.org/cgi/content/short/55/3/515 http://dx.doi.org/10.1006/jmsc.1997.0344 |
op_rights |
Copyright (C) 1998, International Council for the Exploration of the Sea/Conseil International pour l'Exploration de la Mer |
op_doi |
https://doi.org/10.1006/jmsc.1997.0344 |
container_title |
ICES Journal of Marine Science |
container_volume |
55 |
container_issue |
3 |
container_start_page |
515 |
op_container_end_page |
521 |
_version_ |
1766005524762984448 |