Ключевые слова: acipenser, acipenseriformes, actinopterygii, animal, aquaculture, aquarium, background, beluga, carp, caspian, caviar, closeup, critically, dark, diving, endangered, endemic, european, fauna, fish, fishes, fishing, food, freshness, freshwater, head, huso, huso huso, lake, life, natural, nature, one, predator, river, rubbery, russia, russian, saltwater, sea, siberian, sky, sterlet, sturgeon, swim, underwater, volga, water, wild, wildlife,