Whitefish Identification Guide
Tell a lake whitefish apart from other coregonids using its small downturned mouth and deep silvery body.
Read the full Whitefish encyclopedia entry →Key identification features
- Small, toothless mouth set below and behind the tip of the snout (subterminal), adapted for feeding along the bottom
- Silvery sides with an olive-brown to gray-green back
- Moderately deep, laterally compressed body compared to other whitefish relatives
- Large, easily visible cycloid scales
- Small adipose fin and a deeply forked tail
Common look-alikes
- Cisco: has a more terminal, slightly upturned mouth with the lower jaw projecting, plus a slimmer body and larger eye
- Round whitefish: body is more cylindrical in cross-section rather than laterally flattened, giving it a rounder, torpedo-like profile
- Bloater and other deepwater ciscoes: noticeably larger eyes suited to low-light deep water and a more slender build
Where you'll see one
Lake whitefish live in deep, cold, well-oxygenated lakes across northern North America, including the Great Lakes and countless boreal lakes in Canada and the northern United States, typically feeding near the bottom in schools. They often travel in loose aggregations over gravel or sand substrate and move into shallower water to spawn in late fall.
Frequently asked questions
How do I tell a lake whitefish from a cisco in the same lake?
Check the mouth — a lake whitefish's mouth points downward for bottom feeding, while a cisco's mouth is more terminal with the lower jaw often projecting slightly upward.
What is the quickest visual clue that a fish is a whitefish rather than a trout?
Whitefish have small, nearly toothless mouths and large, easily visible scales, whereas trout have larger mouths with visible teeth and smaller scales.