Crayfish, crayfish, crayfish.
"Smallmouth were the easiest to figure out," Parsons said. "The diet that was observed was dominated by crayfish -- significantly more than half in the summer. In the fall, they ate a few more fish. Smallmouth really don't eat a lot of fish, but if they do eat them, they'll generally eat yellow perch, and occasionally bluegill, crappie, darters and shiners. The proportion of walleye they eat is very small."