Sturgeon

Any one of numerous species of large cartilaginous ganoid fishes belonging to Acipenser and allied genera of the family Acipenseridae. They run up rivers to spawn, and are common on the coasts and in the large rivers and lakes of North America, Europe, and Asia. Caviare is prepared from the roe, and isinglass from the air bladder.

large primitive fishes valued for their flesh and roe; widely distributed in the North Temperate Zone