Prosopium williamsoni, Mountain whitefish : fisheries, gamefish

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Prosopium williamsoni (Girard, 1856)

Mountain whitefish
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Image of Prosopium williamsoni (Mountain whitefish)
Prosopium williamsoni
Picture by Keeley, E.R.

Classificatie / Names Populaire namen | Synoniemen | Catalog of Fishes (gen., sp.) | ITIS | CoL | WoRMS | Cloffa

Actinopterygii (Straalvinnigen) > Salmoniformes (Salmons) > Salmonidae (Salmonids) > Coregoninae
Etymology: Prosopium: Greek, prosopon = face (Ref. 45335);  williamsoni: Named after Lieut. R. S. Williamson of the U.S. Pacific Railroad Exploration.  More on author: Girard.

Environment: milieu / climate zone / depth range / distribution range Ecologie

; zoetwater benthopelagisch; diepteverspreiding 5 - 20 m (Ref. 1998), usually 5 - 6 m (Ref. 1998).   Temperate; ? - 23°C (Ref. 12741); 68°N - 39°N

Verspreiding Landen | FAO regio's | Ecosystems | Voorkomen | Point map | Introducties | Faunafri

North America: Mackenzie River drainage in Northwest Territory, Canada south through western Canada and northwestern USA in the Pacific, Hudson Bay and upper Missouri River basins to Truckee River drainage in Nevada and Sevier River drainage in Utah, USA.

Size / Gewicht / Leeftijd

Maturity: Lm ?  range ? - ? cm
Max length : 70.0 cm TL mannelijk/geslacht niet bekend; (Ref. 40637); common length : 23.4 cm TL mannelijk/geslacht niet bekend; (Ref. 12193); Maximaal gepubliceerd gewicht: 2.9 kg (Ref. 40637); Maximaal vermelde leeftijd: 17 jaren (Ref. 72462)

Korte beschrijving Morfologie | Morfometrie

Dorsale stekels (totaal): 0; Dorsale zachte stralen (totaal): 11-15; Anale stekels 0; Anale zachte stralen: 10 - 13; Wervels: 53 - 61. Body slender, elongate, nearly cylindrical in cross section but variable, more compressed laterally than round whitefish. Head short; eye moderate, its diameter less than snout length; snout more or less pointed, compressed laterally, pinched, rounded in lateral view, a single flap of skin present between nostrils. Mouth small, ventral in position, overhung by snout; maxillaries extending posteriorly almost to anterior margin of eye in adults. Teeth small, restricted to a small patch on tongue and on gill rakers in adults, although small teeth may be present on the premaxillaries in young, but absent from jaws, vomer, palatines and pre maxillae in adults. Overall coloration silvery, but light or dark brown or olive on back, becoming silvery in sides and white below. Scales, specially on back, may have pigmented borders. dorsal fin often dusky, pelvic and pectoral fins in adults with amber tint.

Biologie     Verklarende woordenlijst (b.v. epibenthic)

Occurs in lakes and fast, clear or silty streams. Feeds mainly on benthic organisms such as aquatic insect larvae, mollusks, fishes, and fish eggs (including their own) but may feed on plankton and surface insects when the need arises (Ref. 1998).

Life cycle and mating behavior Geslachtsrijpheid | Voortplanting | Kuitschieten | Eieren | Fecundity | Larven

Voornaamste referentie Upload your references | Referenties | Coördinator | Medewerkers

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)

Status op de Rode Lijst van het IUCN (Ref. 120744)


CITES (Ref. 118484)

Not Evaluated

CMS (Ref. 116361)

Not Evaluated

Gevaarlijk voor mensen

  Harmless





Gebruik door de mens

Visserij: van minder commercieel belang; vis voor de hengelsport: ja
FAO(Publication : search) | FishSource |

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Estimates based on models

Phylogenetic diversity index (Ref. 82805):  PD50 = 0.5156   [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00501 (0.00408 - 0.00616), b=3.18 (3.12 - 3.24), in cm Total Length, based on LWR estimates for this species (Ref. 93245).
Trophic Level (Ref. 69278):  3.7   ±0.1 se; Based on diet studies.
Generation time: 6.8 ( na - na) years. Estimated as median LN(3)/K based on 1 growth studies.
Weerstandsvermogen (Ref. 120179):  laag, minimale populatieverdubbelingstijd 4,5-14 jaar (tmax=14).
Kwetsbaarheid (Ref. 59153):  High vulnerability (55 of 100) .
Prijsklasse (Ref. 80766):   Very high.