Longnose Sucker
The longnose sucker is native across virtually all of Canada — from Labrador and the James Bay lowlands west through the Great Lakes, the prairies, and BC, all the way to the Northwest Territories.
Most anglers encounter them incidentally while fishing for trout or walleye, but a dedicated spring run draws sucker-specific anglers who target them with light tackle in cold, clear tributaries.
Scientific Name: Catostomus catostomus
Also known as Longnose, northern sucker, fine-scaled sucker
- Olive to dark brown or nearly black on the sides, fading to a cream-white belly; spawning adults develop a vivid red-orange lateral stripe.
- The long snout overhangs the mouth noticeably — the clearest field mark separating it from the similar white sucker, which has a shorter, blunter snout.
- Cylindrical body with a forked tail; large, fleshy lips covered in small bumps (papillae) on the lower jaw — built for vacuuming the bottom.
- Typical fish run 8–15 inches and 1–3 lbs; larger individuals pushing 20–25 inches and 5–6 lbs turn up in deep lake habitat.
What to know
Habitat Distribution
- Native across virtually all of Canada — one of the most broadly distributed freshwater fish in the country, reaching north to Kugluktuk in the Northwest Territories and east to Labrador.
- Common in cold, clear rivers and streams with gravel or cobble bottoms; also found in the deep, cool zones of large lakes including the Great Lakes (less common in Lake Erie).
- In BC, shares river systems with largescale suckers; throughout the prairies and boreal shield, it's often the dominant sucker species in cold-water drainages.
- Can tolerate brackish conditions near Arctic river mouths — unusually broad salinity tolerance for a freshwater sucker.
Key Locations
- Hay River, Northwest Territories — documented spawning runs with fish stacking in tributary riffles at ice-out.
- Great Lakes tributaries in Ontario — longnose suckers run cold, clear streams in spring alongside other sucker species.
- Boreal shield rivers across northern Ontario, Manitoba, and Saskatchewan — cold, clear drainages where they're often the most abundant bottom fish.
- BC interior river systems — present throughout cold-water drainages, often alongside bull trout and mountain whitefish.
Specific Spots
- In rivers, look for them in slower water just downstream of riffles — they hold in the current break where food collects on the bottom without requiring much energy to maintain position.
- Deep lake fish concentrate near the thermocline in summer, often at 20–50 feet over soft bottom where invertebrates are dense.
- During spring spawning runs, they stack up in shallow gravel riffles of tributary streams — sometimes in numbers large enough to see from the bank.
- Undercut banks and submerged boulders provide cover in streams; fish the downstream edge where current slows.
Longnose Sucker FAQ
Answers from onWater's species guide.
What are the best lures and bait for Longnose Sucker?
Nightcrawlers or worm pieces on a small hook fished on the bottom, the single most reliable approach across all Canadian waters. Keep it simple and keep it down.
When is the best time to fish for Longnose Sucker?
Spring (ice-out through early June in most of Canada), peak season as fish move into shallow tributaries to spawn; easiest time to locate and target them in numbers. Summer, fish retreat to deeper, cooler lake water or hold in the deeper pools of rivers; still catchable but less concentrated.
How do you catch Longnose Sucker?
Most Canadian anglers fish longnose suckers from shore or wading, using light spinning gear with bait fished on the bottom. Spring spawning runs in tributary streams are the most productive time, when fish concentrate in shallow gravel riffles and can be spotted and targeted directly.
What do Longnose Sucker eat?
Bottom invertebrates are the core of the diet, midge larvae (chironomids), aquatic worms, and small crustaceans. Small jigs tipped with worm or maggot imitate this well; a plain hook with a piece of nightcrawler fished on the bottom is the most consistent producer.
Where do Longnose Sucker live?
Native across virtually all of Canada, one of the most broadly distributed freshwater fish in the country, reaching north to Kugluktuk in the Northwest Territories and east to Labrador.
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