Jorge Rojas thinks big when he goes fishing at Lake Fayetteville. Big means carp weighing 20 pounds or more for Rojas and his son, David, 8, on their trips most Sundays to the Fayetteville city lake.

Tourists from Northeast Ohio to northwest Pennsylvania can relax, as the famous bread-fed carp at Pymatuning Reservoir can still be rewarded with day-old bakery goods. At least bread, anyway. The ...