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  • 1
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    Laichen von Dorschen in Gefangenschaft. Teil 2: Eiqualität und Befruchtungsrate (2021)
    In:  martina.bleil@vti.bund.de | http://aquaticcommons.org/id/eprint/3272 | 1240 | 2012-05-10 13:50:19 | 3272 | Bundesforschungsanstalt für Fischerei
    Details
    Publication Date: 2021-06-26
    Description: The quality of eggs spawned by cod of the western Baltic Sea, which were kept in captivity, varies during spawning season. These changes were independent of total length, weight and age of the parental individuals. Diameter, dry weight and fertilisation rate of the spawned eggs decreased during the spawning activities. An influence of water temperature and salinity on the variability of these parameters could not be detected. Diameter, weight and fertilisation rate were, however, influenced by the stage of the spawning process of the parental individuals. These results point out that within the first half of the spawning season not only the largest portion of the fertilised eggs was spawned but also those eggs with the best chance of a successful development.
    Description: Johann Heinrich von Thünen-Institute, Federal Research Institute for Rural Areas, Forestry and Fisheries began publishing the Informationen aus der Fischereiforschung = Information on Fishery research in 2010.
    Keywords: Ecology ; Fisheries ; reproduction ; embryonic development ; spawning activity ; brood stock ; fertilization ; Baltic cod
    Repository Name: AquaDocs
    Type: article , FALSE
    Format: application/pdf
    Format: application/pdf
    Format: 10-16
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  • 2
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    Laichen von Dorschen in Gefangenschaft. Teil 1: Verlauf der Laichaktivitäten (2021)
    In:  martina.bleil@vti.bund.de | http://aquaticcommons.org/id/eprint/3558 | 1240 | 2012-11-09 13:42:47 | 3558 | Bundesforschungsanstalt für Fischerei
    Details
    Publication Date: 2021-06-27
    Description: Individuals of the western stock of Baltic cod were kept at captivity with different temperatures and salinities until natural spawning. Spawning activities up to 16 weeks were observed between February and June. This time interval agrees weIl with the spawning season of the wild cod stock. Also as in in-situ observations larger individuals started earlier with the spawning process than smaller ones and hadsignificantly larger periods of spawning. Larger cods produced more batches and more eggs than smaller cods within this time interval. The comparison between the actual and potential absolut fecundity showed large differences. Only apart of the potential absolut fecundity, estimated in the phase of prespawning development of ovaries, was developed until their release. These analyses showed that larger cod were able to develop a larger part ofthe eggs within the ovaries up to the complete development. This result should be considered in the future during estimations of the population fecundity of the western Baltic spawning stock.
    Description: Johann Heinrich von Thünen-Institute, Federal Research Institute for Rural Areas, Forestry and Fisheries began publishing the Informationen aus der Fischereiforschung = Information on Fishery research in 2010.
    Keywords: Biology ; Ecology ; Environment ; Fisheries ; recruitment ; fertilization ; hatching rate ; larval development ; Baltic Sea
    Repository Name: AquaDocs
    Type: article , FALSE
    Format: application/pdf
    Format: application/pdf
    Format: 164-170
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