Walleye are clearly the most saught after species on Lake Koshkonong, but it also supports a strong channel catfish population which has excellent numbers of fish from 15 to 18 inches, and large catfish up to 24 inches! Featured Species: Walleye, Channel Catfish, Bullhead and Carp Map Features: Lake Profile Fishery Information Fishing Tips and Techniques Over 65 Fishing Points of Interest with GPS 54 Marked Fishing Locations 16 Access Locations All New FHS Look and Cartography