Fish diurnal

Longnose Sucker

Catostomus catostomus

A master of the riverbed, the Longnose Sucker is a fascinating native species known for its remarkable spring migrations and unique 'vacuum' profile. Often called the 'Red Sucker' for its brilliant breeding colors, it is a true indicator of clean, cold water.

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Quick Identification

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Size

Typically 12–25 inches (30–64 cm) in length; weight ranges from 1–5 lbs (0.5–2.3 kg)

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Colors

Dark olive, brownish, or slate-grey back with a contrasting white or cream-colored belly; breeding males develop a vivid, fiery red stripe along their sides.

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Key Features

Distinctive long and pointed snout that projects well past the mouth
Fleshy, downward-facing 'suction cup' mouth with thick lips
Small, fine scales compared to the larger scales of the White Sucker
Streamlined, cylindrical body shape built for bottom-dwelling

When You’ll See Them

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Activity pattern diurnal

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Peak hours 6-10 AM and 4-8 PM

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Season April-June (during the spring spawning run)

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Diet A specialized bottom-feeder (benthivore) that uses its vacuum-like mouth to consume aquatic insect larvae, small mollusks, crustaceans, and algae from rocks and riverbeds.

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Habitat Prefers cold, clear water in deep lakes and turbulent northern streams; often found in the deepest pools of rivers during winter.

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Behavior

The Longnose Sucker is a resilient bottom-feeder known for its impressive seasonal migrations. While they spend much of the year in the deeper, cooler waters of lakes or large rivers, they become highly visible during the spring when they move into shallow tributary streams to spawn. They are social fish, often seen in large groups during these runs, braving swift currents and rocky shallows to find the perfect gravel beds for their eggs.

Unlike many more aggressive fish species, Longnose Suckers are relatively shy and will quickly dart away if they sense heavy vibrations or sudden shadows on the water. They play a crucial role in the ecosystem by cycling nutrients from the bottom of the food chain, acting as a 'cleanup crew' for organic matter and serving as a vital food source for larger predators like pike, bears, and eagles.

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Camera Tips

Capturing the Longnose Sucker requires a shift from traditional trail cameras to underwater action cameras or specialized submersible housings. The absolute best time to deploy your gear is during the spring spawning run when the water temperature reaches about 5°C (41°F). Look for shallow 'riffles'—areas where the water ripples over gravel and cobble. Secure your camera to a weighted base or a heavy rock, angling it slightly upward to capture the sunlight filtering through the water, which will highlight the iridescent scales and the vibrant red stripe found on breeding males.

Because these fish are sensitive to movement and vibration, it is best to set your camera in a fixed position and leave the area for several hours. High-frame-rate settings (60fps or higher) are recommended, as these fish move surprisingly fast when navigating currents or engaging in spawning behavior. If you are placing a camera in a backyard stream, try to find a natural 'choke point' where the water narrows, forcing the fish to swim closer to your lens for a clearer shot.

Water clarity is your biggest challenge when filming fish. Positioning the lens within 12 to 24 inches of a known gravel bed ensures that the fine details—like the unique overhanging snout and the small scales—are visible. If the water is slightly turbid, avoid using built-in LEDs as they will reflect off suspended particles; instead, rely on natural midday sun for the best illumination. During the spawn, the fish are focused entirely on reproduction rather than food, so choosing the right location is far more effective than using any form of bait.

Similar Species

Species that look similar or are commonly confused with Longnose Sucker.

White Sucker

The White Sucker has a shorter, blunter snout and significantly larger scales that are easily visible to the naked eye.

Shorthead Redhorse

Features bright red fins and much larger, mirror-like scales, lacking the elongated snout of the Longnose Sucker.

Frequently Asked Questions

Longnose Sucker are primarily diurnal, meaning they are most active during daylight hours. They are particularly busy during the early morning and late afternoon when they move into shallower water to forage for food along the river bottom.

Since they are aquatic, you can only attract them if you have a clean, cold-water stream or river on your property. Maintaining a natural shoreline with plenty of rocks and minimal silt will encourage them to use the area for foraging and spawning.

They are benthic feeders that use their fleshy lips to suck up food from the bottom. Their diet consists mostly of aquatic insects like midge larvae, small snails, and algae scraped off rocks.

They are common in northern suburban areas that are situated near large, cold lakes or clear river systems. However, they are sensitive to pollution and siltation, so they are rarely found in heavily degraded urban waterways.

The most reliable way is the snout; the Longnose Sucker has a much longer snout that clearly overhangs the mouth. Additionally, the Longnose Sucker has much smaller, finer scales, particularly near the front of its body.

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