Smallmouth Bass
Micropterus dolomieu
Overview
The smallmouth bass is widely regarded as the finest freshwater game fish in North America on a pound-for-pound basis, combining explosive strikes, acrobatic leaps, and dogged fighting ability that surpasses even the most celebrated trout species. Distinguished from its largemouth cousin by a smaller mouth that does not extend past the eye, bronze-brown coloring, and dark vertical bars on the flanks, the smallmouth bass thrives in clear, cool rivers and rocky lakes across the northern and eastern United States and southern Canada. Smallmouth bass on a fly rod provide action that many experienced anglers compare favorably to steelhead and Atlantic salmon. They are particularly responsive to topwater flies, crashing poppers and crayfish patterns with a ferocity that generates addictive surface explosions. The smallmouth's preference for clear, moving water and rocky habitat makes it an ideal species for wade fishing with a fly rod.
warmwaterLeast Concern; populations are healthy and expanding in many areas, though some native southern Appalachian populations face pressure from habitat degradation
Taxonomy
Order
Perciformes
Family
Centrarchidae
Genus
Micropterus
Species
M. dolomieu
Habitat & Behavior
Clear, cool rivers with rocky bottoms and moderate current; rocky lakes with minimal vegetation; prefers clean water with temperatures of 60-75°F
Native Range: Great Lakes basin, upper Mississippi, Ohio, and Tennessee River drainages; Saint Lawrence River and associated waterways in the northeastern United States and southeastern Canada
Introduced Range: Nearly every US state and southern Canada; also Europe, Africa, Asia, and South America, though less widely than largemouth bass
Diet
Crayfish are the primary food source in most habitats, supplemented by small fish (darters, minnows, sculpin), hellgrammites, dragonfly nymphs, and leeches
Spawning
Smallmouth bass spawn in late spring when water temperatures reach 60-65°F, typically from May through June. Males select nest sites on rocky or gravel substrates in 2-6 feet of water. Like largemouth bass, males guard the nest and fry aggressively for several weeks after hatching.
Spawning Months
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Spawning Temperature: 60-65°F
Conservation Status
Least Concern; populations are healthy and expanding in many areas, though some native southern Appalachian populations face pressure from habitat degradation
The Smallmouth Bass is currently classified as Least Concern; populations are healthy and expanding in many areas, though some native southern Appalachian populations face pressure from habitat degradation. Responsible catch-and-release practices help protect populations for future generations of anglers.
Fly Fishing Tips
Smallmouth bass are strongly associated with rocky structure. Focus on current seams below riffles, boulder gardens, ledge drops, and rocky points on lakes. Crayfish patterns are the single most productive fly for smallmouth in rivers. Fish them on a dead drift through likely holding water or strip them erratically along the bottom.
Tackle Recommendations
A 9-foot 6-weight rod is perfect for most smallmouth bass fishing, offering enough power for larger flies while maintaining sensitivity for subtle takes. Use 8-12 lb fluorocarbon tippet.
Distribution Map
Recommended Fly Patterns
Clouser Minnow #2-6
Woolly Bugger #4-8
Popper #4-8
Crayfish patterns #4-8
Hellgrammite #4-8
Muddler Minnow #4-8
Deer Hair Diver #2-6
Where to Find Smallmouth Bass
Rivers with Smallmouth Bass
Quick Facts
- Scientific Name
- Micropterus dolomieu
- Family
- warmwater
- Average Size
- 12-18 inches, 1-4 lbs
- Record Size
- 11 lbs 15 oz (Dale Hollow Lake, Tennessee, 1955)
- Lifespan
- 10-15 years in northern latitudes, with slower growth but longer lifespans in cold-water environments
- Water Temp Range
- 55-78°F (optimal 65-75°F for active feeding)
- Native Range
- Great Lakes basin, upper Mississippi, Ohio, and Tennessee River drainages; Saint Lawrence River and associated waterways in the northeastern United States and southeastern Canada
- Conservation
- Least Concern; populations are healthy and expanding in many areas, though some native southern Appalachian populations face pressure from habitat degradation
Fun Facts
- Smallmouth bass are considered the strongest freshwater fish in North America relative to their size, producing more force per pound than any trout species
- They are extremely sensitive to water quality and are absent from polluted or heavily silted waterways, making them an indicator of stream health
- The name dolomieu honors French mineralogist Deodat de Dolomieu, though the fish has no connection to the Dolomite mountains
- Smallmouth bass have been known to leap completely out of the water up to 3 feet high when hooked, sometimes multiple times in a single fight
Size Reference
Average Size
12-18 inches, 1-4 lbs
World Record
11 lbs 15 oz (Dale Hollow Lake, Tennessee, 1955)