Gizzard shad
Dorosoma cepedianum 

For More Information on Gizzard shad:
Ohio State Dept of Natural Resources
Maryland State Dept of Natural Resources

Distribution:  
Across the U.S.

Origin:  
The Atlantic and Gulf Coasts

Characteristics:  
Silvery, deep-bodied fish with a black spot behind upper end of opercle, a triangular-shaped, axillary process at base of pelvic fin, and a sharp, saw-like ridge on the belly

Impacts:  
They compete with other baitfish as well as young sport fish for food.  They also eat zooplankton that filter out nuisance algae.  They are an important food source for adult fish, however.

Management:  
Nebraska is doing nothing to control these fish

These fish were stocked intentionally for forage… in one or more unspecified areas (presumably the Platte River) of Nebraska.