Ontario divides the province into 20 Fisheries Management Zones (FMZs), each with specific regulations on species, catch limits, size restrictions, and open seasons.
| FMZ | Region | Notable Species |
| FMZ 1 | Northwestern Ontario | Walleye, Northern Pike, Lake Whitefish |
| FMZ 4 | Mid-Northern Ontario | Walleye, Muskellunge, Smallmouth Bass |
| FMZ 5 | Northcentral Ontario | Lake Trout, Brook Trout, Walleye |
| FMZ 6 | Northeastern Ontario | Walleye, Northern Pike, Lake Whitefish |
| FMZ 13 | Central Ontario | Walleye, Bass, Musky, Lake Trout |
| FMZ 15 | Central Ontario cottage country | Walleye, Smallmouth Bass, Lake Trout |
| FMZ 18 | Eastern Ontario | Walleye, Largemouth Bass, Northern Pike |
| FMZ 19 | Lake Simcoe Area | Lake Trout, Walleye, Yellow Perch |
Before fishing, you must know which FMZ you are in. The Ontario Fishing Regulations Summary, published annually, lists all rules by zone. You can find your FMZ using the interactive map at ontario.ca/fishing.
If your question is specifically about the Ontario fishing opener 2026, use the opener guide next. This province page owns the licence and Outdoors Card setup; the opener guide owns bass, walleye, FMZ dates, and waterbody exception checks.