DOI

  • Author: Mion, M.

    Swedish University of Agricultural Sciences, Sweden

  • Author: Thorsen, A.

    Institute of Marine Research, Norway

  • Author: Vitale, F.

    Swedish University of Agricultural Sciences, Sweden

  • Author: Dierking, J.

    GEOMAR Helmholtz Center for Ocean Research Kiel, Germany

  • Author: Herrmann, J.P.

    University of Hamburg, Germany

  • Author: Huwer, Bastian

    Section for Marine Living Resources, National Institute of Aquatic Resources, Technical University of Denmark, Kemitorvet, 2800, Kgs. Lyngby, Denmark

  • Author: von Dewitz, Burkhard

    GEOMAR Helmholtz Center for Ocean Research Kiel, Germany

  • Author: Casini, M.

    Swedish University of Agricultural Sciences, Sweden

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The disappearance of larger individuals and the decrease in individual body condition suffered by Atlantic cod Gadus morhua in the eastern Baltic during the past two decades can be expected to affect the stock reproductive output. To investigate this, female G. morhua were collected during the spawning and pre-spawning period in 2015-2016. The current individual potential fecundity (FP ) of eastern Baltic G. morhua was estimated and analysed in relation to total length (LT ) and indices of nutritional status such as body condition (K) and hepato-somatic index (IH ) using generalized linear models. In addition, the current prevalence of atresia and its potential relation to K were investigated. Moreover, a calibration curve to estimate FP from oocyte diameter, based on the autodiametric oocyte counting method, was established for the first time for eastern Baltic G. morhua and can be used for future fecundity studies on this stock. The results showed that FP was mainly positively related to fish length, but K and IH also contributed significantly to the variation in FP . The model predicted that fish with K = 1·2 have a FP 51% higher than fish of the same LT with K = 0·8. The prevalence of fecundity regulation by atresia was 5·8%, but it was found only in fish in the pre-spawning maturity stage and with low K. Temporal changes in biological features such as the length composition and individual body condition of eastern Baltic G. morhua, should be accounted for when estimating stock reproductive potential
Original languageEnglish
JournalJournal of Fish Biology
Volume92
Issue number4
Pages (from-to)1016-1034
ISSN0022-1112
DOIs
StatePublished - 2018
CitationsWeb of Science® Times Cited: 0
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