出典:Wikipedia
出典:『Wikipedia』 (2011/05/03 03:33 UTC 版)
Alosa immaculata is a species of ray-finned fish in the genus Alosa. It lives in the Black Sea and Sea of Azov, and adults migrate up rivers to spawn. Although the species used to migrate as far upstream as the Danube at Mohács (Hungary), the building of dams has limited the species. It currently migrates up the Danube, Dnieper, Dniester, Southern Bug, Don and Kuban rivers.