Sexual maturity and spawning biomass of the cod stock on flemish cap (division 3M)

11 página, 5 tablas, 3 figuras.-- Scientific Council Meeting

Bibliographic Details
Authors: Saborido-Rey, Fran, Junquera, Fran
Format: article
Publication Date:1999
Country:España
Institution:Consejo Superior de Investigaciones Científicas (CSIC)
Repository:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/48511
Online Access:http://hdl.handle.net/10261/48511
Access Level:Open access
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spelling Sexual maturity and spawning biomass of the cod stock on flemish cap (division 3M)Saborido-Rey, FranJunquera, Fran11 página, 5 tablas, 3 figuras.-- Scientific Council MeetingIn recent years, in Flemish Cap cod has been observed a progressive reduction on age and size at maturity from 1992 to 1995 (Saborido-Rey and Junquera, 1998). This reduction was probably a response to low population abundance and accordingly a certain recovering of the spawning biomass would be expected. However there was a lack of incoming recruitment in the latest years, which make the biomass of the Flemish Cap cod being in the lowest value recorded. Despite of the improvement in the scientific advice with the incorporation of new models in terms of uncertainty, the lack of biological realism can produce an inappropriate model assumptions, as for example those concerned with static life history parameters (Helser and Brodziak, 199-8). Several studies conftrm that population density is an important mechanism in regulating the dynamics of marine ftsh populations (TrippeL 1995; Tyler et aI., 1997) affecting to several life history parameters, as growth and age/size and maturity (Roff, 1984) and hence the possibility of the spawning biomass to increase in order to permit the rebuilding of the stock. Size and age at maturity of the Flemish Cap female cod has been determined by an histological method since 1990 at summer, when the ED-survey is carried out. The method uses cod ovaries in the cortical alveoli stage as an index of the onset of the oocyte development for the next breeding season, whereas the presence of postovulatory follicles in the ovaries shows the already spawned females (Zamarro et aI., 1993). The cortical alveoli are the ftrststructures to appear during the phase of oocyte growth (Wallace and Selman, 1981), and therefore they are the ftrst sign of the start of the female ripening before the beginning of the vitellogenesis. The postovulatory follicles are the structures left in the ovary after maturation is ftnished and oocyte ovulation. The spawning season of the. Flemish Cap cod is known to be short in time and the earliest in the year of all cod stocks in the Northwest Atlantic (Myers et aI., 1993); it occurs around March. This method allow to accurately detect the proportion of both recruit and repeat mature females at the very beginning of the gonad development, as it happens in summer, few months after spawning, when it is very difficult to make a visual diagnosis of the sexual maturity stage (Morrison, 1990). In this paper the proportion of females with postovulatory follicles in July 1998 is used to determine the size and age at maturity in 1996 and the proportion of females in the cortical alveoli stage to estimate the same parameters for 1999. Estimation of the spawning stock biomass is calculated and its evolution in the period 1990-1998 discussedNorthwest Atlantic Fisheries OrganizationConsejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]201220121999info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501http://hdl.handle.net/10261/48511reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)InglésN4085http://archive.nafo.int/open/sc/1999/scr99-029.pdfSíinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/485112026-05-22T06:33:51Z
dc.title.none.fl_str_mv Sexual maturity and spawning biomass of the cod stock on flemish cap (division 3M)
title Sexual maturity and spawning biomass of the cod stock on flemish cap (division 3M)
spellingShingle Sexual maturity and spawning biomass of the cod stock on flemish cap (division 3M)
Saborido-Rey, Fran
title_short Sexual maturity and spawning biomass of the cod stock on flemish cap (division 3M)
title_full Sexual maturity and spawning biomass of the cod stock on flemish cap (division 3M)
title_fullStr Sexual maturity and spawning biomass of the cod stock on flemish cap (division 3M)
title_full_unstemmed Sexual maturity and spawning biomass of the cod stock on flemish cap (division 3M)
title_sort Sexual maturity and spawning biomass of the cod stock on flemish cap (division 3M)
dc.creator.none.fl_str_mv Saborido-Rey, Fran
Junquera, Fran
author Saborido-Rey, Fran
author_facet Saborido-Rey, Fran
Junquera, Fran
author_role author
author2 Junquera, Fran
author2_role author
dc.contributor.none.fl_str_mv Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
description 11 página, 5 tablas, 3 figuras.-- Scientific Council Meeting
publishDate 1999
dc.date.none.fl_str_mv 1999
2012
2012
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
format article
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/48511
url http://hdl.handle.net/10261/48511
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv N4085
http://archive.nafo.int/open/sc/1999/scr99-029.pdf
Sí
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv Northwest Atlantic Fisheries Organization
publisher.none.fl_str_mv Northwest Atlantic Fisheries Organization
dc.source.none.fl_str_mv reponame:DIGITAL.CSIC. Repositorio Institucional del CSIC
instname:Consejo Superior de Investigaciones Científicas (CSIC)
instname_str Consejo Superior de Investigaciones Científicas (CSIC)
reponame_str DIGITAL.CSIC. Repositorio Institucional del CSIC
collection DIGITAL.CSIC. Repositorio Institucional del CSIC
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,81155

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