Hybrid between Squalius squalus and Alburnus arborellaHybrid between Squalius squalus and Alburnus arborella Photographed in Ombrone river, Tuscany, Italy. Released after photo.From Wikimedia Commons
S. Fk. Holston River, Washington Co., VA, tuberculate adult male, 110mm SL. N. Burkhead & R. Jenkins, courtesy Virginia Division of Game and Inland Fisheries