Cod Populations In The Eastern Baltic Sea And The White Sea: The Environmental Extremeness As A Factor Of Two Unique Reproduction Strategies Formation ...

• Main Author: Karasiova, E.M.
• Format: Conference Object
• Language: unknown
• Published: ASC 2009 - Theme session G 2024
• Subjects: Ecosystem observation, processes and dynamics; Pressures, impacts, conservation, and management; White Sea; Gadus morhua
• Online Access: https://dx.doi.org/10.17895/ices.pub.25071086.v1; https://ices-library.figshare.com/articles/conference_contribution/Cod_Populations_In_The_Eastern_Baltic_Sea_And_The_White_Sea_The_Environmental_Extremeness_As_A_Factor_Of_Two_Unique_Reproduction_Strategies_Formation/25071086/1

No abstracts are to be cited without prior reference to the author.Two populations of numerous cod stocks in the Northeastern Atlantic Ocean – the eastern Baltic cod Gadus morhua callarias and the White Sea cod Gadus morhua maris-albi – are inhabiting the intra-continental seas, where reproduction conditions are close to the extreme ones to the species as a whole. Some aspects of their reproductive strategy are considered with reference to the determining influence of the environment conditions extremeness. The unique feature of the White Sea cod consists in coincidence of its reproduction peak with the hydrological winter season and negative water temperatures. The biological sense of this adaptation is to avoid summer decline of the surface salinity leading to decrease of eggs buoyancy. As a result of adaptation to maturation and reproduction at the extreme temperature conditions, the White Sea cod strategy is directed to reduction of expenses for power-consuming functions: fecundity and growth rate. The ...