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Poor regulated fishery, pollution, fragmentation and loss of habitat are most   important factors influencing decline of sterlet population worldwide. In   Middle and Lower Danube region, this species still have significant economic   importance since wilde populations are commercially exploited, while Upper   Danube populations are dependent on stocking efforts in order to maintain   their presence in open waters. Aim of present study is to analyze genetic   diversity of sterlet populations from the Middle and Lower Danube and Lower   Tisza rivers, as a prerequisite for their effective conservation and   management. Analysis of a highly variable D-loop fragment of mitochondrial   DNA detected five new haplotypes, while the eight previously identified   haplotypes had extended their previous range. Genetic variability could be   attributed almost entirely to individuals, with observed lack of population   structure. Negative values of neutrality test indicate recent expansion on   some sampling locations. Adittionaly, gene flow analysis between Lower and   Middle Danube region showed intensive exchange of speciemens. At the same   time analysis showed some influence of Tisza dam on gene flow between samples   from Tisza and Middle Danube section.Our study indicated the need for a   careful planning of sterlet stocking programmes and inclusion of demographic   data or catch time-series. [Projekat Ministarstva nauke Republike Srbije, br.   173045

New data on sterlet (Acipenser ruthenus L.) genetic diversity in the middle and Lower Danube sections, based on mitochondrial DNA analyses