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：2013
卷号：19
期号：21
页码：25-34
语种：English
出版社：Institutul National de Cercetare-Dezvoltare Delta Dunarii
摘要：The NW Black Sea basin supports sympatric population of beluga (Huso huso),stellate sturgeon (Acipenser stellatus) and Russian sturgeon (A. gueldenstadetii). These ecologically similar fish exhibit varying life strategies during their extended juvenile period and appear to overlap at some stages within the marine coastal waters. The aim of the study was to assess the distribution and genetic diversity of sturgeons feeding in the Black Sea coastal area of the Danube Delta Biosphere Reserve (DDBR) during 2012. A total number of 76 sturgeons (70 stellate , 5 beluga and 1 Russian sturgeon) were captured during three fishing expeditions along the Romanian Black Sea coast of the DDBR using two fishing methods: active (pelagic trawling) and passive fishing (bottom set trammel nets). A high number of stellate sturgeons were captured in Sahalin and Zatoane areas highlighting their importance as feeding sites for all life stages of this species. Capturing of only 5 beluga sturgeon specimens suggested that coastal waters are less important feeding areas for this species. Genetic diversity of stellate and beluga sturgeons was assessed by PCR-RFLP of mtDNA D-loop region. Six out of ten composite haplotypes were detected in stellate sturgeons and two composite haplotypes in beluga sturgeons. Further studies on the dynamics of sturgeon population, on behavioural and ecological factors influencing the seasonal distribution are prerequisite for improved management and sustainable use of these resources of the Black Sea.
