sturgeon fish (kaluga, beluga) swim at the bottom of the aquarium. fish underwater.

fish sturgeon beluga kaluga huso dauricus sterlet salmon fishes underwater stellatus water swim nature acipenseridae diving actinopterygii acipenser bottom sturio river aquarium caspian animal big acipenseriformes wildlife wild aquatic russia atlantic deep beauty background beautiful caviar closeup endangered scuba life sea freshwater rare delicacy fauna color colorful marine natural