Misc

Mottled Sculpin

Cottus bairdii

3.9

At a Glance

Avg Length

Avg Weight

0.05 lbs

World Record

0.1 lbs

Habitat

Rocky Cold Streams

About the Mottled Sculpin

Mottled Sculpin (Cottus bairdii). Found in Rocky Cold Streams. Average length 5 in, weight 0.05 lbs. World record: 0.1 lbs (Eastern USA).

The Mottled Sculpin is one of the most recognizable freshwater species in North American waters, classified scientifically as <em>Cottus bairdii</em>. It belongs to the Misc group, most commonly found in rocky cold streams environments. Anglers target this species for both sport and table fare, and it appears across a broad range of water bodies throughout the United States.

A typical Mottled Sculpin runs 5 inches in length and weighs around 0.05 pounds, though fish in prime habitat regularly exceed these averages. The all-tackle world record stands at 0.1 lbs, set at Eastern USA, making it a legitimate target for anglers chasing personal bests. Conservation status varies by region — check local regulations before keeping fish, as some waters have slot limits or catch-and-release requirements in place.

Habitat & Range

Primary habitat: Rocky Cold Streams.

The Mottled Sculpin thrives across a wide range of freshwater environments throughout North America. Seasonal movements are driven by water temperature — fish tend to move into shallower water during spring and fall feeding periods, and push deeper or seek cover during the heat of summer and cold of winter. Understanding these patterns is critical to locating fish consistently across the season.

How to Fish for Mottled Sculpin

Best bait: Flies.

Technique: Fly Fishing.

Match your presentation to the season and conditions. In clear water, downsize your bait and slow your retrieve. In stained or muddy water, switch to high-contrast colors and add vibration. Early morning and evening are the most productive windows during summer months. During spawning season, fish become highly territorial and will strike out of aggression as well as hunger.

World Record

The all-tackle world record Mottled Sculpin weighed 0.1 lbs, caught at Eastern USA. This record represents the upper end of what this species achieves under ideal conditions. Most anglers targeting personal bests focus on proven trophy waters with the right combination of habitat, forage base, and light fishing pressure.

State Regulations

Regulations vary by state and water body. Before fishing for Mottled Sculpin, verify current size limits, bag limits, and open seasons with your state fish and wildlife agency. Check your state's fishing license requirements and season dates at the FishLog Fishing License guide.