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On the assessment of the reproductive capacity of eastern Baltic cod Gadus morhua callarias (Gadidae) by ichthyoplankton data

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Abstract

Annual egg production in eastern Baltic cod Gadus morhua callarias in 1966–2000 has been assessed. A significant relationship between egg production and recruitment, progeny survival index, and 11psu-isohaline depth has been revealed. Comparison of egg production and spawning stock biomass indices has shown the time difference in their maxima and the absence of significant correlation between them. This difference is assumed to be due to an increase in the share of mature individuals that did not participate in spawning in the late 1970s–early 1980s. The determination of potential egg production, taking into account the share of individuals that spawn during the current year, yielded a significant positive relationship between its value and spawning stock biomass.

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  1. Atlantic Research Institute of Fisheries and Oceanography, ul. Dmitriya Donskogo 5, Kaliningrad, 236022, Russia

    E. M. Karasiova

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  1. E. M. Karasiova
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Correspondence to E. M. Karasiova.

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Original Russian Text © E.M. Karasiova, 2016, published in Voprosy Ikhtiologii, 2016, Vol. 56, No. 3, pp. 335–344.

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Karasiova, E.M. On the assessment of the reproductive capacity of eastern Baltic cod Gadus morhua callarias (Gadidae) by ichthyoplankton data. J. Ichthyol. 56, 435–444 (2016). https://doi.org/10.1134/S003294521603005X

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