Micropterus dolomieu Lacep├Ęde, 1802
Smallmouth bass
Kokuchibasu
Micropterus dolomieu
photo by Steinhart, G.B.

Family:  Centrarchidae (Sunfishes)
Max. size:  69 cm TL (male/unsexed); max.weight: 5,410.0 g; max. reported age: 26 years
Environment:  benthopelagic; freshwater; depth range 1 - 7 m
Distribution:  North America: St. Lawrence-Great Lakes system, Hudson Bay (Red River) 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.
Diagnosis:  Dorsal spines (total): 9-11; Dorsal soft rays (total): 13-15; Anal spines: 10-11; Vertebrae: 31-32
Biology:  Inhabits shallow rocky areas of lakes and clear and gravel-bottom runs and flowing pools of rivers (Ref. 86798). Young feed on plankton and immature aquatic insects while adults take in crayfish, fishes, and aquatic and terrestrial insects (Refs. 1998, 10294, 44091). Is sometimes cannibalistic (Ref. 30578). Preyed upon by fishes and turtles (Ref. 1998). Builds nest, usually at three or four feet deep (Ref. 120821). Excellent food fish (Ref. 1998).
IUCN Red List Status: Least Concern (LC); Date assessed: 01 March 2012 Ref. (124695)
Threat to humans:  potential pest
Country info:  Introduced from North America to Lake Ashinoko in 1925. Present range unclear. Has been recognized to be established in the country or found in the wild (Ref. 53301).

Entered by: Froese, Rainer - 01.05.91
Modified by: Torres, Armi G. - 17.08.19
Checked by: Garilao, Cristina V. - 25.01.96

Source and more info: www.fishbase.org. For personal, classroom, and other internal use only. Not for publication.


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