Lake Koshkonong

Special Fishing Regulations: This lake has special fishing regulations that differ from statewide or border water regulations for those species identified below and take precedence. Regulations listed below are currently in place. Visit the fishing regulations page for links to upcoming regulations for specific lakes.

Special Waterbody Regulations

• Hook and line fishing is open all year for fish species except muskellunge, lake sturgeon, trout, paddlefish and threatened or endangered species. Motor Trolling is allowed with up to 3 hooks, baits, or lures, per angler.

Special Species Regulations

• Walleye: See Walleye, Sauger, and Hybrids.
• Panfish: Open all year: No minimum length limit and the daily bag limit is 25
• Walleye, Saugers, and Hybrids: Open all year: The minimum length limit is 18” and the daily bag limit is 3
• Bullheads: Open all year: No minimum length limit and the daily bag limit is unlimited
• Catfish: Open all year: No minimum length limit and the daily bag limit is 10
• Cisco and whitefish: Open all year: No minimum length limit and the daily bag limit is 10
• Lake sturgeon: Closed. No fishing allowed.
• Muskellunge and hybrids: May 3, 2025 to December 31, 2025: The minimum length limit is 40” and the daily bag limit is 1
• Northern pike: Open all year: The minimum length limit is 26” and the daily bag limit is 2
• Largemouth bass and smallmouth bass: Open all year: The minimum length limit is 14” and the daily bag limit is 5
• Largemouth bass: See Largemouth and Smallmouth Bass.
• Smallmouth bass: See Largemouth and Smallmouth Bass.
• Paddlefish: Closed. No fishing allowed.
• Rock, Yellow, and White Bass: Open all year: No minimum length limit and the daily bag limit is unlimited
• Rough fish: Open all year: No minimum length limit and the daily bag limit is unlimited
• Round goby: Open all year: The daily bag limit is 0, one may be killed and possessed for transport to a WDNR Office
• Ruffe: Open all year: The daily bag limit is 0, one may be killed and possessed for transport to a WDNR Office
• Shovelnose sturgeon: Closed. No fishing allowed.
• Trout and salmon: See Trout regulations layer.
• White perch: Open all year: The daily bag limit is 0, one may be killed and possessed for transport to a WDNR Office
• Bluegill: See Panfish.
• Bowfin: See Rough Fish.
• Channel catfish: See Catfish.
• Crappies: See Panfish.
• Flathead catfish: See Catfish.
• Hybrid, Striped, Yellow, and White Bass: See Rock, Yellow and White Bass.
• Longnose gar: See Rough Fish.
• Sauger and hybrids: See Walleye, Sauger, and Hybrids.
• Shortnose gar: See Rough Fish.
• Urban waters gamefish: This waterbody is not considered an urban water, Urban Waters Gamefish regulations do not apply.