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Brook Trout

Brook Trout

Brook trout (Salvelinus fontinalis) in Idaho are actually non-native fish introduced over 100 years ago from eastern North America.

Despite their non-native status, they've established thriving populations across Idaho's mountain streams and lakes, particularly in high-elevation, cold-water environments.

Scientific Name: Salvelinus fontinalis

Physical Characteristics:
  • These char are distinguished by their olive-green bodies with distinctive cream-colored spots on dark backgrounds, red spots with blue halos along the flanks, and characteristic white and black edged orange fins.
  • In Idaho's diverse waters, brook trout can range from typical 6-10 inch stream fish to larger specimens in fertile lake environments.

What to know

Habitat Distribution

  • They've established thriving populations across Idaho's mountain streams and lakes, particularly in high-elevation, cold-water environments.

Key Locations

  • Idaho's brook trout populations are found throughout multiple regions including the Panhandle, Clearwater, Southwest, and mountain lake systems, with particularly notable populations in alpine lakes and spring-fed streams.
  • The state record standing at 7.2 pounds from Henry's Lake.

Specific Spots

  • Focus on spring-fed streams, deep pools, areas with current breaks, the bases of rapids and waterfalls, and undercut banks.
  • In Idaho's alpine lakes, fish shallow areas in spring and fall, deeper during summer heat.

Brook Trout FAQ

Answers from onWater's species guide.

What are the best lures and bait for Brook Trout in Idaho?

Small inline spinners like #0-#1 Mepps, Panther Martins, or Blue Fox spinners. Small spoons and jigs in dark colors are productive, particularly 1/8-ounce marabou jigs. Natural baits include garden worms, nightcrawlers, and floating Berkley Trout Bait.

What flies work for Brook Trout in Idaho?

Size 14-16 Purple Tunghead Hot Spot Pheasant Tail Jigs, Beadhead Prince Nymphs, Elk Hair Caddis, Stimulators in yellow or olive (sizes 10-14), Royal PMX patterns, Spotlight Caddis Emergers, and Hard Body Ants. Small streamers like Woolly Buggers in olive, brown, or black work well.

When is the best time to fish for Brook Trout in Idaho?

Spring (March-May) and fall (September-November) are most productive. Spring offers excellent fishing as water temperatures reach 40-49°F, triggering insect hatches and increased feeding activity.

How do you catch Brook Trout in Idaho?

Small streamers like Woolly Buggers should be stripped along banks during high water periods. Focus on stealth when approaching in clear mountain water.

What do Brook Trout eat?

Brook trout are opportunistic feeders consuming terrestrial insects, aquatic invertebrates, small fish, crustaceans, zooplankton, worms, and various aquatic larvae including ephemeripterans and dipterans.

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