Classification / Names
Common names | Synonyms | Catalog of Fishes (gen., sp.) | ITIS | CoL | WoRMS | Cloffa
Actinopterygii (ray-finned fishes) > Cypriniformes
(Carps) > Cyprinidae
(Minnows or carps) > Leuciscinae
Etymology: Semotilus: Greek, sema = banner (dorsal fin) + Greek, tilos = spotted; used by Rafinesque (Ref. 45335); atromaculatus: From the words ater, meaning black; and maculatus, spotted (Ref. 10294).
Environment / Climate / Range
Freshwater; demersal. Temperate; ? - 30°C (Ref. 35682); 55°N - 31°N
Size / Weight / Age
Maturity: Lm ?  range ? - ? cm
Max length : 30.3 cm TL male/unsexed; (Ref. 10294); common length : 19.1 cm TL male/unsexed; (Ref. 12193); max. reported age: 8 years (Ref. 12193)
North America: most of eastern USA and southeastern Canada in Atlantic, Great Lakes, Hudson Bay, Mississippi and Gulf basins as far as Manitoba, Montana, Wyoming, Colorado, Oklahoma, and Texas, but absent from southern Georgia and peninsular Florida; upper Pecos and Canadian River systems, New Mexico.
Adults inhabit rocky and sandy pools of headwaters, creeks and small rivers (Ref. 5723); mostly found in tiny, intermittent streams. Young feed on small aquatic invertebrates. Adults consume small fish, crayfish and other large invertebrates (Ref. 10294). One of the most common fishes in eastern North America (Ref. 5723).
Male digs a pit in the stream bottom by removing mouthful of gravel, guards the pit and attempts to attract females. Spawning occurs over the pit. Male guards the nest from intruders. As eggs are deposited in the pit, the male covers them with stones and excavates another pit immediately downstream. As spawning continues and the male covers the eggs, a long ridge of gravel develops.
Page, L.M. and B.M. Burr, 1991. A field guide to freshwater fishes of North America north of Mexico. Houghton Mifflin Company, Boston. 432 p. (Ref. 5723)
IUCN Red List Status (Ref. 96402)
CITES (Ref. 94142)
Threat to humans
ReferencesAquacultureAquaculture profileStrainsGeneticsAllele frequenciesHeritabilityDiseasesProcessingMass conversion
Estimates of some properties based on models
Phylogenetic diversity index (Ref. 82805
= 0.5625 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.01175 (0.00715 - 0.01930), b=3.02 (2.87 - 3.17), based on LWR estimates for species & Subfamily-body shape (Ref. 93245
Trophic Level (Ref. 69278
): 4.0 ±0.5 se; Based on diet studies.
Resilience (Ref. 69278
): Medium, minimum population doubling time 1.4 - 4.4 years (tmax=8).
Vulnerability (Ref. 59153
): Moderate vulnerability (38 of 100) .