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: Rhinichthys: Greek, rhinos = nose + Greek, ichthys = fish (Ref. 45335); atratulus: From the word atratus, meaning clothed in black (Ref. 10294).
Environment / Climate / Range
Freshwater; demersal. Temperate; ? - 29°C (Ref. 35682); 57°N - 34°N
Size / Weight / Age
Maturity: Lm ?  range ? - ? cm
Max length : 12.4 cm TL male/unsexed; (Ref. 10294); common length : 5.7 cm TL male/unsexed; (Ref. 12193); max. reported age: 3 years (Ref. 12193)
soft rays: 7. Body stout, spindle-shaped; mouth slightly inferior, slightly oblique and extending to below nostril; pointed barbel in groove at angle of mouth. Gill rakers short, conical, widely spaced (Ref. 54725).
North America: primarily in Atlantic slope drainages from Nova Scotia (Maritimes, Canada), to south Carolina and Georgia, USA. Its former subspecies, R. obtusus is found primarily in upper Mississippi and Ohio drainages, USA and in Manitoba, Canada.
Inhabits rocky runs and pools of headwaters, creeks and small rivers (Ref. 5723, 10294). Feeds on aquatic insects (Ref. 54729, 10294); also on diatoms and other algae (Ref. 54725). Considered as an attractive aquarium pet and propagation through artificial fertilization is practical (Ref. 54725).
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.
IUCN Red List Status (Ref. 90363)
Threat to humans
ReferencesAquacultureAquaculture profileStrainsGeneticsAllele frequenciesHeritabilityDiseasesProcessingMass conversion
CollaboratorsPicturesStamps, CoinsSoundsCiguateraSpeedSwim. typeGill areaOtolithsBrainsVision
Estimates of some properties based on empirical models
Phylogenetic diversity index (Ref. 82805
= 0.5020 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00813 (0.00390 - 0.01697), b=3.13 (2.96 - 3.30), based on LWR estimates for this Subfamily-BS (Ref. 93245
Trophic Level (Ref. 69278
): 3.1 ±0.39 se; Based on food items.
Resilience (Ref. 69278
): High, minimum population doubling time less than 15 months (tmax=3).
Vulnerability (Ref. 59153
): Low vulnerability (23 of 100) .