Abundance of Northeast Arctic haddock year classes and its governing factors ...

• Main Author: Yu.M.Lepesevich
• Format: Article in Journal/Newspaper
• Language: unknown
• Published: ASC 2005 - O - Theme session 2024
• Subjects: Fisheries and aquaculture; Ecosystem observation, processes and dynamics; Pressures, impacts, conservation, and management; Arctic; Barents Sea
• Online Access: https://dx.doi.org/10.17895/ices.pub.25350292.v1; https://ices-library.figshare.com/articles/conference_contribution/Abundance_of_Northeast_Arctic_haddock_year_classes_and_its_governing_factors/25350292/1

No abstracts are to be cited without prior reference to the author.In 1950-1997, on the basis of analysis of both biotic and abiotic factors it was ascertain that mean annual water temperature at the first and second years of life of Northeast Arctic haddock cohorts exerts maximal influence on their abundance. Abundant year classes were registered only in normal and warm years. In periods of evident cooling of the Barents Sea all year classes were poor independently on the spawning stock condition, food supply and other factors. Year-to-year variations of water temperature profoundly affect the abundance of year classes as well. Abundance of year classes very largely depends on a size and structure of the spawning stock. In years, when biomass of mature individuals was at a high level and based on fish of older age classes, even unfavourable environmental conditions not always led to appearance of poor year classes. In the period of drastic decrease of a size of spawning stock and its rejuvenation, the ...