caa a22 4500 445295767 CHVBK 20180317142541.0 cr unu---uuuuu 170323e20100701xx s 000 0 eng 10.1134/S0032945210060056 doi (NATIONALLICENCE)springer-10.1134/S0032945210060056 Dynamics of structural parameters of populations of the bream Abramis brama (Cyprinidae) in Rybinsk Reservoir in 1954-2007 [Elektronische Daten] [Yu. Gerasimov, S. Brazhnik, A. Strelnikov] The data on age, size, and sex structure of the population, on the linear and weight growth of bream Abramis brama are generalized for the period of 1954-2007 in Rybinsk Reservoir. Analysis of dynamics of these parameters demonstrated that recently a high fishing intensity is both reflected on the size of the stock but also determines the changes in structural parameters of the bream population. At present, in the exploited stock of bream, the specimens of junior ages dominate. The part of specimens older than ten years, which previously made the bulk of catches, now compose not more than 10-15%. This resulted in a rather noticeable decrease of mean age and size in catches. The previously observed sex ratio, near 1: 1, shifted towards a significant prevalence of males. The age of the first spawning and of the fish spawning for the first time decreased. These changes indicate that the fishing load surpasses adaptational potential of bream. Pleiades Publishing, Ltd., 2010 bream nationallicence fishery nationallicence ichthyomass nationallicence age structure nationallicence size composition nationallicence sex ratio nationallicence maturation age nationallicence linear-weight growth nationallicence Gerasimov Yu Papanin Institute for the Biology of Inland Waters, Russian Academy of Sciences (IBIW RAS), 152742, Borok, Nekouz raion, Yaroslavskaya oblast, Russia aut Brazhnik S. Russian Federal Research Institute of Fisheries and Oceanography (VNIRO), ul. Verkhnyaya Krasnoselskaya 17, 107140, Moscow, Russia aut Strelnikov A. Papanin Institute for the Biology of Inland Waters, Russian Academy of Sciences (IBIW RAS), 152742, Borok, Nekouz raion, Yaroslavskaya oblast, Russia aut Journal of Ichthyology SP MAIK Nauka/Interperiodica 50/6(2010-07-01), 465-474 0032-9452 50:6<465 2010 50 11489 https://doi.org/10.1134/S0032945210060056 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1134/S0032945210060056 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Gerasimov Yu Papanin Institute for the Biology of Inland Waters, Russian Academy of Sciences (IBIW RAS), 152742, Borok, Nekouz raion, Yaroslavskaya oblast, Russia aut NATIONALLICENCE 700 1- Brazhnik S. Russian Federal Research Institute of Fisheries and Oceanography (VNIRO), ul. Verkhnyaya Krasnoselskaya 17, 107140, Moscow, Russia aut NATIONALLICENCE 700 1- Strelnikov A. Papanin Institute for the Biology of Inland Waters, Russian Academy of Sciences (IBIW RAS), 152742, Borok, Nekouz raion, Yaroslavskaya oblast, Russia aut NATIONALLICENCE 773 0- Journal of Ichthyology SP MAIK Nauka/Interperiodica 50/6(2010-07-01), 465-474 0032-9452 50:6<465 2010 50 11489 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer