Largescale Sucker

FishBase gives the largescale sucker a maximum length of about 61 cm, in the same class as the longnose and white suckers, and describes adults as fish of pools and runs in medium to large rivers, and of lakes. Pearson Ecological’s Fraser Valley guide describes adults as bronze with a whitish belly, juveniles as brown to olive green with dark patches, and the scales as large, usually fewer than 75 along the lateral line. The same guide notes it is the only sucker in the Fraser Valley that grows past 30 cm.

Look at the snout and the lower lip. BC Hydro’s Peace River identification key, built on the McPhail and Carveth field key, puts it plainly:

FishBase places the largescale sucker on the Pacific slope from the Nass River south through the Columbia and Snake systems, and east of the Rockies in the Peace River drainage. In the Kootenays the records are in the big water. BC Hydro’s lower Columbia indexing surveys, which electrofish the Columbia River from Hugh L. Keenleyside Dam to the US border and the last stretch of the Kootenay below Brilliant Dam, tagged largescale suckers in their first year and still count suckers among the commonest non-sport fish they see, lumped as “sucker spp.” Montana’s Department of Environmental Quality lists the largescale sucker among the resident fish of Lake Koocanusa. The app’s water lists name suckers only generically, so identify the one you catch.

A study of Okanagan Lake filed in the BC government’s Ecological Reports Catalogue describes largescale suckers as cool-water bottom fish of sand, cobble and boulder shorelines, favouring shallow, weedy margins, and moving from deeper water by day to the shoreline in the evening. FishBase lists the adult diet as algae, diatoms, insects, amphipods and molluscs, and the young eating mayfly, caddis and midge larvae among other things. That is the trout’s menu.

The same Okanagan summary puts largescale spawning in streams once water reaches about 7 to 10 °C, usually in riffles and pools over sand to cobble, and Pearson Ecological says late spring. Writing about eastern white suckers in Hatch Magazine, the guide George Daniel describes trout leaving their usual lies to feed on drifting sucker eggs, pale yellow to light gold, and fishing a small egg pattern of matching colour through the spawn. That is angling advice from another river system, worth trying below a Kootenay sucker run rather than counting on.

You will hook them on a nymph fished on the bottom, the way you would fish a Pheasant Tail or a Hare’s Ear for trout. If you keep catching suckers on a river nymphing rig, your flies are on the stones where suckers feed; shorten the depth a little if trout are the goal.

Release it the way the BC synopsis asks you to release any fish: keep it in the water, cover its eyes if it struggles, and unhook it quickly with pliers. One hooked in the side or tail has been snagged, and the synopsis says any fish snagged, willfully or by accident, must be released immediately.

The 2025–2027 BC Freshwater Fishing Regulations Synopsis does not list the largescale sucker as a protected species and does not name suckers in its Region 4 Kootenay tables. Province-wide rules still apply: no live fish in your possession in the wild, no moving live fish between waters, no fin fish or parts of fin fish as bait except where the synopsis allows it, and no spear fishing at all in Region 4. Check the current synopsis before you fish.

Turn it over and look at the lower lip. A broad V-shaped split that runs back through the lip is a largescale; halves still joined across the middle is a bridgelip. Size helps too: FishBase puts the bridgelip’s maximum at about 30 cm, so a bigger fish is not one.

None of the sources used for this page say so. The largescale is a native fish that shares the bottom with trout. FishBase notes that young bridgelip suckers are eaten by some salmonids, and angling writers describe trout feeding hard on sucker eggs in spring.