The Osetra sturgeon is a species of sturgeon found primarily in the Caspian and Black Sea basins. Known for its distinctive, medium-sized roe, it is highly valued in the caviar market. Osetra sturgeons can grow up to 2 meters in length and are characterized by their olive to brown coloration, which helps them blend into their natural habitat. These fish are anadromous, meaning they migrate from saltwater to freshwater to spawn. Overfishing and habitat loss have led to a decline in their populations, making them a focus of conservation efforts. The Osetra sturgeon is listed as a threatened species under various international regulations.