Cisco

Habitat Distribution

• Native across Canada from the Great Lakes north and west through the boreal zone — one of the most widely distributed coldwater fish in the country.
• Primarily a mid-water, open-lake fish in cold, deep lakes; also found in large rivers in the northern and western parts of its range.
• Requires cold, well-oxygenated water — most abundant in lakes with a deep, cool hypolimnion that stays cold through summer.
• Present in Lake Superior, Lake Huron, Lake Simcoe, and countless boreal lakes across Ontario, Manitoba, Saskatchewan, and Alberta.

Key Locations

• Lake Simcoe, Ontario — a historically significant cisco fishery that collapsed after smelt invaded, now rebounding with regulated ice fishing seasons restored.
• Lake Superior — cisco remain an important part of the lake's cold-water community; commercial and sport harvest managed jointly by Canadian and U.S. agencies.
• Spanish River, Ontario — documented as a fall spawning run destination, with cisco moving in from Georgian Bay.
• Boreal lakes across Manitoba, Saskatchewan, and Alberta — cisco (locally called tullibee) are a primary forage fish and a winter jigging target in countless remote lakes.

Specific Spots

• In summer, cisco suspend in the mid-water column over deep basins where cold water and zooplankton concentrations overlap — find the thermocline, find the fish.
• During ice season, they roam under the ice in open basins; sonar is the best tool for locating suspended schools before dropping a jig.
• In fall and early winter, cisco move toward shallower shoreline areas and river mouths to spawn — the Spanish River in Ontario is one documented example.
• On large lakes like Superior, cisco hold along deep structural transitions and basin edges rather than tight to shore structure.