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Micropterus dolomieu  Lacepède, 1802

Smallmouth bass
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Image of Micropterus dolomieu (Smallmouth bass)
Micropterus dolomieu
Picture by Steinhart, G.B.

Classification / Names Common names | Synonyms | Catalog of Fishes (gen., sp.) | ITIS | CoL | WoRMS | Cloffa

Actinopterygii (ray-finned fishes) > Perciformes (Perch-likes) > Centrarchidae (Sunfishes)
Etymology: Micropterus: Greek, mikros = small + Greek,pteron = wing, fin (Ref. 45335);  dolomieu: Named after M. Dolomieu, French minerologist and friend of Lacepède (Ref. 1998).   More on author: Lacepède.

Environment / Climate / Range Ecology

Freshwater; benthopelagic.   Temperate; 10°C - 30°C (Ref. 12741); 47°N - 34°N

Length at first maturity / Size / Weight / Age

Maturity: Lm ?, range 22 - ? cm
Max length : 69.0 cm TL male/unsexed; (Ref. 5723); common length : 8.0 cm TL male/unsexed; (Ref. 3549); max. published weight: 5.4 kg (Ref. 4699); max. reported age: 26 years (Ref. 46974)

Short description Morphology | Morphometrics

Dorsal spines (total): 9 - 11; Dorsal soft rays (total): 13-15; Anal spines: 10-11; Vertebrae: 31 - 32

Distribution Countries | FAO areas | Ecosystems | Occurrences | Point map | Introductions | Faunafri

North America: St. Lawrence-Great Lakes system, Hudson Bay and Mississippi River basins from southern Quebec in Canada to North Dakota and south to northern Alabama and eastern Oklahoma in the USA. Introduced into many countries for sport fishing. Several countries report adverse ecological impact after introduction.

Biology     Glossary (e.g. epibenthic)

Adults inhabit shallow rocky areas of lakes, clear and gravel-bottom runs and flowing pools of rivers, cool flowing streams and reservoirs fed by such streams (Ref. 1998). Young feed on plankton and immature aquatic insects while adults take in crayfish, fishes, and aquatic and terrestrial insects (Refs. 1998, 10294, 44091). Are sometimes cannibalistic (Ref. 30578). Preyed upon by fishes and turtles (Ref. 1998). Excellent food fish (Ref. 1998).

Life cycle and mating behavior Maturity | Reproduction | Spawning | Eggs | Fecundity | Larvae

The male builds the nest in shallow waters of lakes and rivers, on sand, gravel, or rocky bottoms. Nest building usually occurs within 150 yards of where his nest was built in previous years. The pair swims about the nest, rubbing and nipping each other and eventually come to rest on the bottom. Actual spawning occurs and lasts for 5 seconds. The pair then encircles the nest for about 25-45 seconds, before settling to spawn again. This goes on for 2 hours. After spawning, the female leaves the nest and may spawn with another male in another nest. Males guard the eggs and young. (Ref. 1998).

Main reference Upload your references | References | Coordinator | Collaborators

Scott, W.B. and E.J. Crossman, 1973. Freshwater fishes of Canada. Bull. Fish. Res. Board Can. 184:1-966. (Ref. 1998)

IUCN Red List Status (Ref. 96402)

CITES (Ref. 94142)

Not Evaluated

Threat to humans

  Potential pest




Human uses

Fisheries: commercial; gamefish: yes; aquarium: public aquariums
FAO(Publication : search) | FisheriesWiki | Sea Around Us

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Estimates of some properties based on models

Phylogenetic diversity index (Ref. 82805):  PD50 = 0.5001   [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.01072 (0.00869 - 0.01321), b=3.06 (3.00 - 3.12), based on LWR estimates for this species (Ref. 93245).
Trophic Level (Ref. 69278):  3.6   ±0.2 se; Based on diet studies.
Resilience (Ref. 69278):  Medium, minimum population doubling time 1.4 - 4.4 years (K=0.10-0.28; tm=3-6; tmax=14; Fec=5,000).
Vulnerability (Ref. 59153):  Moderate to high vulnerability (50 of 100) .
Price category (Ref. 80766):   Unknown.