Classification / Names
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Actinopterygii (ray-finned fishes) >
Cypriniformes (Carps) >
Catostomidae (Suckers) > Catostominae
Etymology: Xyrauchen: Greek, xyreo = that cuts like a knife + Greek, auchen = neck (Ref. 45335).
Environment / Climate / Range
Ecology
Freshwater; demersal; potamodromous (Ref. 51243). Temperate; 37°N - 34°N
Size / Weight / Age
Maturity: Lm ?  range ? - ? cm
Max length : 91.0 cm TL male/unsexed; (Ref. 5723); common length : 50.0 cm TL male/unsexed; (Ref. 12193)
North America: Formerly throughout medium to large rivers of Colorado River basin from Wyoming and Colorado in USA to Baja California in Mexico. Presently known only above Grand Canyon and in Lakes Mead, Mohave and Havasu on lower Colorado River in USA.
Occurs in silt-bottomed to rock-bottomed backwaters near strong current and deep pools in medium to large rivers, and impoundments.
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
Harmless
Human uses
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Estimates of some properties based on empirical models
Phylogenetic diversity index (Ref.
82805): PD
50 = 1.0000 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00948 (-0.21977 - 0.23873), b=3.06 (2.94 - 3.19), based on LWR estimates for this family-BS (Ref.
93245).
Trophic Level (Ref.
69278): 3.1 ±0.4 se; Based on size and trophs of closest relatives
Resilience (Ref.
69278): Very Low, minimum population doubling time more than 14 years (Preliminary K or Fecundity.).
Vulnerability (Ref.
59153): High to very high vulnerability (67 of 100) .