Rates of sexual maturation of Atlantic cod in NAFO Division 5Ze and commercial fishery implications
An analysis of maturity data for Georges Bank cod (Gadus morhua) in NAFO Division 5Ze, derived from Canadian 1986–94 spring research surveys, showed a significant de-crease in the total length (~4 cm) and age (~0.5 years) of fish at fifty percent maturity, over the nine year period. Differences in m...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.518.5910 2023-05-15T15:27:33+02:00 Rates of sexual maturation of Atlantic cod in NAFO Division 5Ze and commercial fishery implications J. J. Hunt The Pennsylvania State University CiteSeerX Archives 1996 application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.518.5910 http://journal.nafo.int/J18/hunt.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.518.5910 http://journal.nafo.int/J18/hunt.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://journal.nafo.int/J18/hunt.pdf Key words Cod commercial fishing Georges Bank maturity text 1996 ftciteseerx 2016-01-08T09:59:03Z An analysis of maturity data for Georges Bank cod (Gadus morhua) in NAFO Division 5Ze, derived from Canadian 1986–94 spring research surveys, showed a significant de-crease in the total length (~4 cm) and age (~0.5 years) of fish at fifty percent maturity, over the nine year period. Differences in mean size-at-age for males and females appeared to occur after the age at which full maturity was achieved, allowing the use of data pooled by sex for estimating maturity ogives by length and age. Maturity ogives, derived from the pre-fishery survey data, were adjusted for growth and used to estimate commercial landings of immature cod. Results indicated that over 40 % by number and 20 % by weight of the 1987 catch was of juvenile cod from the 1985 year-class. However, the average 1987–93 catch of juveniles was substantially lower at 15 % by number and 6 % by weight with a decrease in the latter part of the time series. Estimates based on maturity-at-length and at age gave similar results but length was considered the better estimator. Text atlantic cod Gadus morhua Unknown |
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English |
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Key words Cod commercial fishing Georges Bank maturity |
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Key words Cod commercial fishing Georges Bank maturity J. J. Hunt Rates of sexual maturation of Atlantic cod in NAFO Division 5Ze and commercial fishery implications |
topic_facet |
Key words Cod commercial fishing Georges Bank maturity |
description |
An analysis of maturity data for Georges Bank cod (Gadus morhua) in NAFO Division 5Ze, derived from Canadian 1986–94 spring research surveys, showed a significant de-crease in the total length (~4 cm) and age (~0.5 years) of fish at fifty percent maturity, over the nine year period. Differences in mean size-at-age for males and females appeared to occur after the age at which full maturity was achieved, allowing the use of data pooled by sex for estimating maturity ogives by length and age. Maturity ogives, derived from the pre-fishery survey data, were adjusted for growth and used to estimate commercial landings of immature cod. Results indicated that over 40 % by number and 20 % by weight of the 1987 catch was of juvenile cod from the 1985 year-class. However, the average 1987–93 catch of juveniles was substantially lower at 15 % by number and 6 % by weight with a decrease in the latter part of the time series. Estimates based on maturity-at-length and at age gave similar results but length was considered the better estimator. |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
J. J. Hunt |
author_facet |
J. J. Hunt |
author_sort |
J. J. Hunt |
title |
Rates of sexual maturation of Atlantic cod in NAFO Division 5Ze and commercial fishery implications |
title_short |
Rates of sexual maturation of Atlantic cod in NAFO Division 5Ze and commercial fishery implications |
title_full |
Rates of sexual maturation of Atlantic cod in NAFO Division 5Ze and commercial fishery implications |
title_fullStr |
Rates of sexual maturation of Atlantic cod in NAFO Division 5Ze and commercial fishery implications |
title_full_unstemmed |
Rates of sexual maturation of Atlantic cod in NAFO Division 5Ze and commercial fishery implications |
title_sort |
rates of sexual maturation of atlantic cod in nafo division 5ze and commercial fishery implications |
publishDate |
1996 |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.518.5910 http://journal.nafo.int/J18/hunt.pdf |
genre |
atlantic cod Gadus morhua |
genre_facet |
atlantic cod Gadus morhua |
op_source |
http://journal.nafo.int/J18/hunt.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.518.5910 http://journal.nafo.int/J18/hunt.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
_version_ |
1766357982090625024 |