RW. That is a young sturgeon!
They have been known to live 100 years and grow to a half ton in the Colombia River.Some species are marine, e.g., the Atlantic sturgeon Acipenser oxyrhyncus; some ascend rivers to spawn; and some (the largest of inland fish) are found in landlocked waters. The largest species is the Russian sturgeon, or beluga ( A. huso ), of the Caspian and Black seas; it reaches a length of 13 ft (396 cm) and a weight of up to a ton (900 kg). The Pacific sturgeon ( A. transmontanus ) may weigh over half a ton (450 kg) and attain a length of 12 ft (366 cm). The green sturgeon is a smaller Pacific variety, and the common sturgeon is found in coastal waters and rivers of Europe and E North America. Other American species are the rock, or lake, sturgeon ( A. fulvescens ) of the Great Lakes and the Mississippi valley and the shovel-nosed sturgeon, or hackleback ( Scaphirhynchus platorynchus; 3 ft/91 cm), also of the Mississippi valley. http://www.encyclopedia.com/html/s/sturgeon.asp