Micropterus dolomieu Lacepède, 1802
Smallmouth bass
Achigan à petite bouche,  Achigan à petite bouche,  Black bass,  Brown bass,  Green bass,  Northern smallmouth bass,  Smallmouth bass,  Smallmouth black bass
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:  Native species ranging from Manitoba to Nova Scotia; introduced into other provinces (Ref. 52559). Occurs in the Great Lakes (Ref. 119192). Mainstay of the gigantic sport fishery and associated tourist industry in eastern Canada. Restricted as a game fish; capture is controlled by season and bag limits (Ref. 1998). Also Ref. 5723, 86798.

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

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