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Flathead Catfish

Flathead Catfish

Flathead Catfish are not native to Idaho but were introduced to the Snake River system in 1943 and have since established populations throughout the Snake River basin.

These massive predatory catfish can reach impressive sizes, with the potential to grow over 100 pounds, making them the second-largest North American catfish species.

Scientific Name: Pylodictis olivaris

Physical Characteristics:
  • Flatheads are apex predators with a distinctive flat, wide head and projecting lower jaw, typically olive-brown in coloration with a yellowish underside.

What to know

Habitat Distribution

  • Flatheads are benthic fish that prefer deep pools with woody debris, logs, rock piles, and undercut banks.

Key Locations

  • In Idaho, they're primarily found in the Snake River where it forms the border with Oregon, including impoundments like Brownlee Reservoir, Oxbow Reservoir, and Hells Canyon Reservoir.
  • In the Snake River system, target areas near Farewell Bend State Park and the various reservoir arms where flatheads concentrate.

Specific Spots

  • Target deep holes, areas with submerged logs and woody debris, undercut banks, and rock piles in the Snake River impoundments.
  • Fish deep water areas of 20+ feet, and look for current breaks and structure.

Flathead Catfish FAQ

Answers from onWater's species guide.

What are the best lures and bait for Flathead Catfish in Idaho?

Live bait is king for flatheads - use large, lively offerings like bluegills, sunfish, bullheads, carp, creek chubs, and suckers ranging 5-12 inches. Fresh cut bait also works well.

When is the best time to fish for Flathead Catfish in Idaho?

The best time to target flathead catfish in Idaho's Snake River system is during late spring through early fall, with September and October being prime months when they feed heavily before winter. While they can be caught year-round, avoid the spawning period from late June through July.

How do you catch Flathead Catfish in Idaho?

Effective rigs include Carolina slip rigs with 3-way swivels, in-line presentations for current, and dragging rigs with floats to keep bait visible. The key is bait that creates commotion and vibration underwater.

What do Flathead Catfish eat?

They prefer live prey and are voracious carnivores, feeding primarily on fish, crayfish, insects, and anything that moves and creates vibration.

Where do Flathead Catfish live in Idaho?

Flatheads are benthic fish that prefer deep pools with woody debris, logs, rock piles, and undercut banks.

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