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Sturgeons are found in greatest abundance in the rivers of southern Russia and Ukraine and in the freshwaters of North America. guldenstadtii is one of the most valuable species inhabiting the rivers of Russia and occurs eastward to Lake Baikal. It is about the same size as the common sturgeon and is found particularly in the rivers feeding the Black and Caspian seas. ruthenus ), inhabits the Black and Caspian seas and is a valuable food fish about 0.9 m long. stellatus occurs in the rivers of the Black and Caspian seas and of the Sea of Azov. The beluga, or ( Huso huso, or Acipenser huso ), inhabits the Caspian and Black seas and the Sea of Azov. A large sturgeon, it reaches a length of 7.5 m and a weight of 1,300 kg (2,900 pounds), but its flesh and caviar are less valuable than those of smaller species. fulvescens ) of North America occurs in the Mississippi River valley, Great Lakes, and Canada and may weigh more than 90 kg (200 pounds). transmontanus ) occurs on the Pac! ific coast and is the largest of the North American sturgeons, weighing up to 820 kg (1,800 pounds). river sea