Synopsis
Historically, five acipenserid species migrated from the Black Sea into the Danube River: beluga Huso huso, Russian sturgeon Acipenser gueldenstaedtii, stellate sturgeon A. stellatus, ship sturgeon A. nudeventris and perhaps European Atlantic sturgeon A. sturio. The freshwater sterlet A. ruthenus thrived in the Danube and its tributaries. Presently, only three anadromous species occur in the Romanian part of the Danube, Huso huso, A. gueldenstaedtii and A. stellatus, while A. ruthenus lives in the Danube and its tributaries. Extreme depletion in the number of sturgeons was caused by many, primarily anthropogenic, factors which affected the Danube and the Black Sea shell during recent last decades. Measures necessary for saving anadromous sturgeon species in the lower Danube are recommended.
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Bacalbasa-Dobrovici, N. (1997). Endangered migratory sturgeons of the lower Danube River and its delta. In: Birstein, V.J., Waldman, J.R., Bemis, W.E. (eds) Sturgeon Biodiversity and Conservation. Developments in Environmental Biology of Fishes, vol 17. Springer, Dordrecht. https://doi.org/10.1007/0-306-46854-9_10
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