The largescale sucker is native to the Pacific Northwest, occurring from British Columbia south to Oregon. It is widespread in the Columbia River system. It occurs in the slower-moving portions of rivers and streams, and in lakes.

The largescale sucker (Catostomus macrocheilus) is a species of sucker, a type of freshwater fish, found in western North America.

> Largescale Sucker are the most common native fish in the main stem of the Willamette River. > They are the main prey species of large raptors such as ospreys and bald eagles, as well as river otters and other fishes.

The largescale sucker is native to Montanas western drainage. Like the previously mentioned suckers, it is present in both rivers and lakes. In Montana, the maximum size in this species is usually less than 5 pounds.

Largescale suckers live in lakes and in pools and runs of medium to large rivers. They are usually found in shallow water, but sometimes can be found as deep as 80 feet. Fry move to shallows to feed by day and into deeper water at night.

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• Mature in 4th or 5th year and may live more than 11 years. • Adults feed on algae, mollusks and other invertebrates. • Spawn in late spring. • Preyed upon by fish eating birds and by eagles, and bears during spawning. •Occurs in lakes and in slow moving pools and runs of medium to large rivers. •The most common sucker in southern half of BC.

Occurs in pools and runs of medium to large rivers. Also found in lakes. Pelagic up to 1.8 cm in length (Ref. 1998). Young feed on planktonic cladocerans, copepods, ostracods, and mites; chironomid, trichopteran and ephemeropteran larvae; and bottom ooze (Ref. 1998). Adults feed on algae, diatoms, insects, amphipods, and mollusks (Ref. 1998).

Largescale sucker (Catostomus macrocheilus) The largescale sucker is native to the Pacific Northwest, occurring from British Columbia south to Oregon. It occurs in the slower-moving portions of rivers and streams, and in lakes.