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Het OWA, het open archief van het Waterbouwkundig Laboratorium heeft tot doel alle vrij toegankelijke onderzoeksresultaten van dit instituut in digitale vorm aan te bieden. Op die manier wil het de zichtbaarheid, verspreiding en gebruik van deze onderzoeksresultaten, alsook de wetenschappelijke communicatie maximaal bevorderen.

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one publication added to basket [36334]

Early estimates of recruitment of the Belt Sea cod stock Oeberst, R.; Bleil, M. (2003). Early estimates of recruitment of the Belt Sea cod stock. Sci. Mar. (Barc.) 67(S1): 181-190. https://dx.doi.org/10.3989/scimar.2003.67s1181 In: Scientia Marina (Barcelona). Consejo Superior de Investigaciones Científicas. Institut de Ciènces del Mar: Barcelona. ISSN 0214-8358; e-ISSN 1886-8134, meer Ook verschenen in: Ulltang, Ø.; Blom, G. (2003). Fish stock assessments and predictions: integrating relevant knowledge. SAP Symposium held in Bergen, Norway 4-6 December 2000. Scientia Marina (Barcelona), 67(S1). Institut de Ciències de Mar: Barcelona. 374 pp. https://dx.doi.org/10.3989/scimar.2003.67s1, meer

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Beschikbaar in	Auteurs
VLIZ: Open access 67475 [ download pdf ]

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Trefwoorden

Aquatic organisms > Marine organisms > Fish > Marine fish Fisheries > Finfish fisheries > Gadoid fisheries Population factors > Condition factor Properties > Biological properties > Sexual maturity Reproduction ANE, Baltic [Marine Regions]; ANE, Belt Sea [Marine Regions] Marien/Kust

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Oeberst, R. Bleil, M.

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Abstract

The Belt Sea cod stock produced very different year class abundances from 1993 to 1999. After the strong year class 1994 a poor year class 1995 followed. Stronger year classes were observed again in 1996 and in 1997. Comparative analyses of the maturity development of female cods, of the fecundity and of the year class abundance demonstrated the following: The maturity development of female cods from November to March was very different in the years investigated. However, the analyses showed that an early or late beginning of the maturity development did not give any indications concerning the new year class abundance. The year class strength of Belt Sea cod is mainly determined by the portions of female cod having a maturity stage of more than II at the beginning of the main spawning season in March. A trawl survey during the beginning of the spawning season for estimating the portions of active female spawners can be used for assessing the actual potential population fecundity and arriving at a first estimate of the new year class abundance with acceptable accuracy. These data are available before the spawning season of the Belt Sea cod is finished. The large variations of the portions of active female spawners are influenced by the abundance and the spatial distribution of the main prey component age group 1 herring and by the temperature conditions during the prespawning period.

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