freshwater
Largemouth Bass
Micropterus salmoides
Elongated, thick body with a dark green to olive-colored back and a distinctive horizontal dark band or blotches along the flanks. It has two dorsal fins that are nearly separated, a large mouth where the upper jaw extends past the rear margin of the eye, and a white to cream-colored underside.
- Habitat
- Prefer clear to murky quiet waters with aquatic vegetati…
- Size & weight
- Typically 1 to 5 pounds and 12-20 inches, but can reach…
- Diet
- Opportunistic carnivore using an ambush feeding strategy…
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Physical characteristics
Elongated, thick body with a dark green to olive-colored back and a distinctive horizontal dark band or blotches along the flanks. It has two dorsal fins that are nearly separated, a large mouth where the upper jaw extends past the rear margin of the eye, and a white to cream-colored underside.
Habitat & distribution
Prefer clear to murky quiet waters with aquatic vegetation, submerged logs, or rocks. Found in lakes, ponds, reservoirs, and slow-moving rivers across North America and widely introduced globally.
Behavior
Solitary when adult but may school when young (fry). They are primarily diurnal hunters but remain active during dawn and dusk. Often territorial around structure.
Diet
Opportunistic carnivore using an ambush feeding strategy; eats smaller fish, frogs, crayfish, insects, and even small birds or rodents.
Reproduction
Spawns in spring when water temperatures reach 60-75 degrees Fahrenheit. Males build nest depressions in sandy or gravelly bottoms and guard the eggs and fry after hatching.
Ecological role
Top-tier apex predator in many freshwater ecosystems, controlling populations of smaller fish, crayfish, and insects.
Similar species
Smallmouth Bass (upper jaw does not extend past eye; vertical bars); Spotted Bass (scales on the base of the second dorsal fin and a smaller mouth).
Identification tips
Look for the jaw hinge extending behind the eye when the mouth is closed and the deep notch between the spiny and soft dorsal fins.
Interesting facts
Largemouth bass possess a highly sensitive lateral line system that allows them to detect vibrations and movements in the water even in low visibility or complete darkness.