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Prosopium williamsoni
A native Idaho species often overlooked by trout anglers. Whitefish are powerful fighters that school in deep runs and take the same flies and baits as trout.
Clean, cold rivers with gravelly bottoms. They prefer faster water than trout and are found in nearly every trout river in Idaho.
Winter is the classic whitefish season. They aggregate in large schools and feed actively when trout are dormant.
Understand what triggers aggressive strikes.
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A native Idaho species often overlooked by trout anglers. Whitefish are powerful fighters that school in deep runs and take the same flies and baits as trout.
Clean, cold rivers with gravelly bottoms. They prefer faster water than trout and are found in nearly every trout river in Idaho.
Bottom-oriented feeders that focus on aquatic insect larvae. They have small, downturned mouths optimized for picking insects off stones.
Best windows: Bright, sunny winter days.
Winter is the classic whitefish season. They aggregate in large schools and feed actively when trout are dormant.
Productive baits and patterns: Tiny midges, Stonefly nymphs, White/Silver spoons, Maggots (where legal).
Always confirm with the current IDFG rule book before heading out — limits and seasons change by water.
Idaho state record: 6 lbs (Salmon River, 1994).