Preliminary results on the lower Danube sturgeon migration monitoring

Amongst the many severely endangered species range the sturgeons. The diminishing stocks are considered to have been the result of several factors such as energetically hydro technical work, hydro technical work to improve conditions of navigation, excessive fishing, poaching and the increasing pollution. Typical migratory, the Black Sea sturgeons reproduce in rivers flowing here and hence the Danube. Deepening knowledge of migration and breeding conditions in this stage are a must. During the 2011 autumn migration there were monitored 50 copies of sturgeons from 4 species. Initial results showed that some marked specimens haven’t remained on the Lower Danube to winter but returned to the mouth of the sea, using the Old Danube route between km 197 and km 186.