Freshwater · Spring and fall best; April to June and September to October
Largescale Sucker
Catostomus macrocheilus
The big-river background fish of the Fraser and Columbia systems in BC and the Pacific Northwest. Large and common yet often overlooked, it is frequently misreported as a carp or a whitefish by anglers who hook one bottom fishing in the big rivers.
Seasons · Peak
Identifying features
- Large scales — noticeably bigger than on other suckers, hence the name
- Fleshy, downturned sucker mouth with papillae on the lips
- Long dorsal fin with 11-14 rays and a forked tail
- Olive-brown back, pale belly, with a dark stripe in spawning males
- No barbels — separates it at once from common carp
Habits
- Feeds on bottom algae, insect larvae and detritus in big rivers
- Moves into gravel shallows to spawn in spring
- Schools loosely in deep runs and eddies
- Mostly active at dawn, dusk and after dark
- Takes small bottom baits meant for other species
Distribution
Where to find them
- Fraser River deep runs and bridge pools in the valley
- Okanagan River and large lake outlets in spring
- Columbia River eddies along the border reaches
Where they live
How to catch them
Bottom fishing in big-river runs River
Rig: Medium rod, sliding sinker and a worm on a medium hook, fished in deep runs and eddies
Bait/lure: Worms
Key tip: Fish at dusk in deep eddies — largescale suckers feed confidently after dark.
Spring gravel-shallow fishing River
Rig: Float or light bottom rig with dough bait over gravel shallows during the spawn
Bait/lure: Dough bait, corn
Key tip: Target the spring spawning shallows where fish gather densely and bite readily.
Best baits & lures
Baseline setup
- Rod: Medium 7 ft spinning rod
- Line: 8-10 lb mono
- Terminal: Medium hooks, sliding sinkers, floats
Recommended gear for this species
Rod · Best value
9' 5-weight fly rod outfit
≈ US$180-260
Covers chironomid lakes and small rivers with one setup.
Flies · Budget
Chironomid assortment (30 patterns)
≈ US$25-40
Chironomids are 60% of a lake rainbow's diet in spring.
Picks come from our rule library — never paid placements. Prices are guides; affiliate links may earn us a commission.
Typical size
Common 14-20 in; large fish to about 24 in and 6 lb
On the table
Poor to fair — soft and very bony; most are released.
Similar species
White SuckerWhite sucker has much smaller, finer scales and a smaller head; largescale sucker shows bold, large scales and a bigger, broader head
Common CarpCommon carp has a single long dorsal fin, barbels at the mouth and large mirror-like scales with an upturned mouth; largescale sucker has no barbels and a true downturned sucker mouthRegulations vary by area and can change in-season — always check the official rules for your area before you fish. Regulations guide →
Plan a trip for Largescale Sucker
Build today's plan