Russian sturgeon, Danube sturgeon, Osetr, Acipenser gueldenstaedti, Acipenser g?ldenstaedti, Romania, Volga river, Black Sea

freshwater fishes fish fishes freshwater river caviar endangered sea sturgeon acipenser sp lake fresh water nature wildlife close up fish endangered species caviar freshwater fishes seawater fishes no model release querformat horizontal format underwater image photo scuba diving