Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 344816
Title Investigating the use of proxies for fecundity to improve management advice for western horse mackerel Trachurus trachurus
Author(s) Oliveira, J.A.A. De; Roel, B.A.; Dickey-Collas, M.
Source ICES Journal of Marine Science 63 (2006)1. - ISSN 1054-3139 - p. 25 - 35.
Department(s) RIVO Biologie en Ecologie
Publication type Refereed Article in a scientific journal
Publication year 2006
Keyword(s) saronikos gulf greece - total egg-production - cod gadus-morhua - stock assessment - north-sea - recruitment - fish - environment - reproduction - fisheries
Abstract Observations of fecundity from the 2001 western horse mackerel spawning-stock biomass survey suggest that the species is an indeterminate spawner. Therefore, estimates of fecundity based on biological analyses and until recently used in the calibration of the stock assessment are now questioned. The stock is assessed by fitting a linked Separable and ADAPT VPA-based model to the catch-at-age data and to the egg production estimates. Currently, the assumption is that egg production and spawning-stock biomass are linked by a constant but unknown fecundity parameter, estimated within the model. In this study, the effects of introducing relationships linking biological indicators of fecundity, such as lipid content or feeding intensity during the spawning season, to actual fecundity are examined within a simulation framework. Simulations suggest that when the underlying relationships between fecundity and the proxy are poorly described, weak, or based on a relatively short time-series of data, the assumption of constant fecundity will result in better management advice than using the proxy
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