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© 2026 Barbless.co. Flow and gauge data from USGS; weather from Open-Meteo. · v2026.10.18.2

  1. Home
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  3. Bass & panfish
  4. Largemouth Bass

Updated September 26, 2026

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Largemouth Bass: fish species profile

Fish › Bass & panfish

Bass & panfishCentrarchidaeGNR · ESA: Not listed

Largemouth Bass

Micropterus salmoides

A warmwater predator that thrives around shallow cover and hits hardest in low-light periods.

Overview

Size range

16–38 in

Size range

16–38 in

Size range

Typical adult length in the waters we cover.

Water temperature

Warmwater

Water temperature

Warmwater

Water temperature

Preferred thermal regime for this species.

Origin

Introduced

Origin

Introduced

Origin

Stocking and native history where this species is found.

About Largemouth Bass

Largemouth bass are an introduced warmwater sport fish in Idaho. They inhabit lakes and some streams, especially shallow, weedy, cover-rich water where ambush feeding is effective.

Also known as: largemouth

Largemouth Bass Silhouette

  • Largemouth Bass species silhouette
    Primary

Behavior

spawning
Spawning occurs in spring to early summer as waters warm; fish become less focused on feeding during this period.
feeding style
An ambush-oriented predator that feeds most actively at dawn and dusk, often near the surface and around vegetation; larger fish become mostly fish-eaters.
seasonal notes
Feeding slows in winter and also during the spawning period. Activity is strongest in warm water.

Habitat

water types
lakes, ponds, reservoir coves, slow streams
preferred holds
Shallow, warm, vegetated water; small shallow lakes, protected bays, weed edges, and other cover-rich shoreline areas.

Where Found

  • Largemouth bass

    Snake River, American Falls Reservoir to Gem Lake Dam

Largemouth Bass on the podcast

  • Captain Bryce Tedford - Stripers, Smallmouth, Largemouth, and moving to California

    Episode 174 · Jan 24, 2022

    Captain Bryce Tedford - Stripers, Smallmouth, Largemouth, and moving to California

    Listen on the Barbless Podcast

Angler Tactics

tactics
Target warm, shallow cover such as weeds, brush, docks, and bay margins, especially at first light and evening. Fish slower in cooler conditions, and focus on areas where bass can pin bait near vegetation.
effective methods
soft plastics, jigs, spinnerbaits, topwater lures, swimbaits/live minnow imitations

Regulations

Check the current Idaho fishing seasons and rules for the specific water before fishing, as bass limits and harvest rules can vary by location.

Regulations vary by water. Check current Idaho Fish and Game rules before fishing.

Conservation

Status: Introduced to Idaho

GNR · ESA: Not listed

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OverviewSilhouetteBehaviorHabitatWhere FoundFrom the PodcastAngler TacticsRegulationsConservation

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