 The sturgeon stocks associated with the Danube River basin have, over the centuries, formed the basis of a large and significant commercial fishery, renowned throughout the world.The construction of the dams, beside overfishing and river pollution has a significant role over sturgeon population decline because create a barrier for fish migratory species that usually spawn in the upper parts of the river.The spawning areas of migratory fishes species has been dramatically reduced by the construction of hydropower and navigation systems at Iron Gates I (1974) and Iron Gates II (1984).