siberian sturgeon acipenser baerii in fresh water with a dark background.a large freshwater fish in the dark water. fish

siberian sturgeon acipenser baerii fresh water dark background large freshwater fish aquatic life russian food commercial head lena beautiful stenorrhynchus wild animal caviar angara irtysh kazakhstan acipenseridae acipenseriformes asia asian baikal china colorful endangered fauna fishes kolyma natural nature river russia siberia swim underwater wildlife yenisei zoo which obtained