期刊名称：Scientific Annals of the Danube Delta Institute
印刷版ISSN：1842-614X
电子版ISSN：2247-9902
出版年度：2021
卷号：26
DOI：10.7427/DDI.26.05
语种：English
出版社：Institutul National de Cercetare-Dezvoltare Delta Dunarii
摘要：In the summer-autumn of 2019 (in all 6 months) fish fauna was investigated in different sites of Lower Danube River of its arms: Unique/United Danube in front of first split at Chilia Point (Ceatal), Sf. Gheorghe arm, Sulina arm, Chilia arm and few nearby networking canals. In study period was assessed the ecological status of fish fauna and fish community inside of ichthyocenoses, as abundance (dominance), biomass and frequency, even anthropogenic impact. In all sampling sites it were recorded 58 fish species included Ameiurus melas, A. punctatus (this meaning new records of two exotic species silurids observed and posed by fishermen first time in Danube Delta Biosphere Reserve - DDBR), but with few species less than past when was recorded 66 species (at the beginning of third millennium) and much more in 20 century. From 68 total number of fish species, 14 populate Anexes of Habitate Directive (Alosa immaculata, A. tanaica, Leuciscus aspius, Romanogobio kessleri, R. vladykovi, Rhodeus amarus, Zingel zingel, Z. streber, Misgurnus fossilis, Cobitis elongatoides and 4 sturgeon species). In 2019 fish fauna was dominated in abundance by Alburnus alburnus, Blicca bjoerkna and Carassius gibelio, but in biomass by Blicca bjoerkna, Scardinius erythrophthalmus, Cyprinus carpio, Carassius gibelio and Silurus glanis with differences between sampling methods. Main anthropogenic pressures consists legal and illegal overfishing and pollution.
关键词：fish community;ecological status;arms of Lower Danube River
