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 349527
Title Gape morphology of cod Gadus morhua L., haddock Melanogrammus aeglefinus (L.) and whiting Merlangius merlangus (L.) through metamorphosis from larvae to juveniles in the western Irish Sea
Author(s) Rowlands, W.L.; Dickey-Collas, M.; Geffen, A.J.; Nash, R.D.M.
Source Journal of Fish Biology 69 (2006)5. - ISSN 0022-1112 - p. 1379 - 1395.
Department(s) IMARES
Publication type Refereed Article in a scientific journal
Publication year 2006
Keyword(s) northern north-sea - prey size - fish larvae - growth efficiency - feeding-habits - gadoid larvae - predator size - niche breadth - food - zooplankton
Abstract Variations in standard length (LS), gape size (SG) and jaw length (LJ) were studied in larval and juvenile gadoids (cod Gadus morhua, haddock Melanogrammus aeglefinus and whiting Merlangius merlangus) from 4 to 70 mm. The increase in SG and LJ was not linear with respect to LS. The relationship was best described by segmented regression lines in all three species, with an inflection point at c. 10·5 mm. The SG and LJ increased more rapidly in relation to larval LS for individuals smaller than this inflection point size. The rates of increase slowed significantly post-inflection, an effect more noticeable in SG data compared to LJ data. In each case, the inflection point fell in the intermediate period of development between the larval and juvenile stages, which could be considered as metamorphosis. Published equations that have been used to predict SG from LJ lead to the overestimation of gape. New relationships are presented, which may be used to predict SG from measurements of either LS or upper jaw length in cod, haddock and whiting.
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