Round Whitefish (Prosopium cylindraceum) fish identification

Round Whitefish

Prosopium cylindraceum

Also known as

Menominee Whitefish, Frost Fish

IUCN status

Least Concern

About the Round Whitefish

The Round Whitefish boasts a slender, cylindrical body, typically sporting an olive-brown back that fades into light silvery sides and a bright white belly. Its small, underslung mouth is perfectly adapted for foraging along the lakebed. These fish commonly measure between 9 and 19 inches, offering a respectable catch for anglers.

Source: FishBase & iNaturalist

Habitat

Primarily found in cold, oxygen-rich freshwater lakes, the Round Whitefish prefers deeper sections, often near rocky bottoms or gravel shoals. They can also inhabit large rivers with suitable conditions, especially during spawning migrations.

Distribution

Their extensive range spans across North America, from the vast lakes of Alaska and Canada eastward through the Great Lakes region and into New England.

Behaviour

As dedicated bottom feeders, Round Whitefish tirelessly forage for a diet consisting mainly of small invertebrates like crustaceans, insect larvae, and fish eggs. They are known for their schooling behavior in deeper waters, moving to shallower areas for spawning, often in late fall or early winter. Their feeding activity can be quite subtle, requiring a keen eye from anglers.

Edibility

★★★★

Prized for its delicate, mild flavor and firm, flaky white flesh, the Round Whitefish is excellent table fare. It's superb when smoked, pan-fried, or baked, making for a truly enjoyable meal.

Lure suggestion

Targeting Round Whitefish requires finesse. Small jigs tipped with a grub or a piece of nightcrawler, tiny spoons, or micro-baits presented directly on the bottom are highly effective. Fly anglers can find success with small nymph patterns or midge larvae imitations. Patience and a sensitive rod are key to detecting their often subtle bites.

Round Whitefish Regulations

Select a state to see size limits, bag limits, and seasons for Round Whitefish.

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Always confirm with the official state agency before keeping a fish.

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Tips & Tactics

Related Species

Where to Catch Round Whitefish

States where Round Whitefish is found, based on CatchVault's waterbody commonality data.

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