Ranging Year-Class Strength And Survival Rates During Early Life History Of The Barents Sea Food Fishes To Establish Biological Reference Points And Evaluate Environmental Effects ...

• Main Authors: Bondarenko, M.V., Krovnin, A.S., Serebryakov, V.P.
• Format: Article in Journal/Newspaper
• Language: unknown
• Published: ASC 2003 - Y - Theme session 2024
• Subjects: Fisheries and aquaculture; Technologies and data; Pressures, impacts, conservation, and management; Arctic cod; Arctic; Barents Sea; Greenland; Northeast Arctic cod
• Online Access: https://dx.doi.org/10.17895/ices.pub.25348591; https://ices-library.figshare.com/articles/conference_contribution/Ranging_Year-Class_Strength_And_Survival_Rates_During_Early_Life_History_Of_The_Barents_Sea_Food_Fishes_To_Establish_Biological_Reference_Points_And_Evaluate_Environmental_Effects/25348591

No abstracts are to be cited without prior reference to the author.Survival index (SI) of a year class in early life history is defined as the ratio of abundance of fish at age 3 to population fecundity (PF), or to the spawning stock biomass (SSB). SI is considered here to be an integrated indicator of survival conditions during early life, i.e. periods of egg, larval and fry development. Ranking of SI by means of cluster analysis revealed three types of survival conditions – favourable, moderate and unfavourable. The corresponding values of SI (*10-6) to these three types of conditions were estimated in spring spawning Norwegian herring as 152.49, 28.27, 4.97; in Northeast Arctic cod – 16.94, 6.40, 3.05; in Northeast Arctic haddock – 24.18, 8.55, 2.00; and in Greenland halibut of the Barents Sea – 219.29, 101.24, 45.60. Regression equations were obtained describing dependence of reqruitmtent on spawning stock size in three types of survival condtitions for each of the stocks considered. Three levels of PF ...