Rudd 
(Scardinius erythrophthalmus)
Rudd X Golden shiner Hybrid
Golden shiner
(Notemigonus crysoleucas)
 
The top photo is the rudd, a native of Europe that was brought to this country late in the 1800s. It is cultured in several states and distributed to bait stores in as many as 16 states. The rudd is established in New York and Maine and possibly Nebraska and South Dakota. On the bottom is our native golden shiner, Notemigonus crysoleucas. The problem is that the rudd can hybridize with the golden shiner.  This hybridization is the first known non-salmonid intergeneric cross of an exotic and a native species.