Alaska country information

Common names: [No common name]
Occurrence: native
Salinity: freshwater
Abundance: | Ref:
Importance: subsistence fisheries | Ref: Morrow, J.E., 1980
Aquaculture: | Ref:
Regulations: | Ref:
Uses: no uses
Comments: Occurs in most Alaskan rivers that empty into the Bering, Chukchi and Beaufort seas, throughout the Kuskokwim River drainage and well above Umiat in the Colville, and in the lower reaches of the Yukon (Ref. 27547). It extends eastward along the arctic coast at least to the Sagavanirktok River (Ref. 27547). Abundant only during spawning concentrations (Ref. 27547). A commercial operation on the Colville River delta takes about 1,000 fish annually (Ref. 28214). Also Ref. 6876, 28503, 96339, 119194, 121277.
National Checklist:
Country Information:
National Fisheries Authority: http://www.state.ak.us/local/akpages/FISH.GAME/adfghome.htm
Occurrences: Occurrences Point map
Main Ref: Morrow, J.E., 1980
National Database:

Common names from other countries

Siberian whitefish, Bottom Whitefish, Kropffelchen, ... more

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> Salmoniformes (Salmons) > Salmonidae (Salmonids) > Coregoninae
Etymology: Coregonus: Greek, kore = pupils of the eye + Greek, gonia = angle (Ref. 45335).
More on author: Gmelin.

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

marien; zoet water; brak water demersaal; anadroom (Ref. 51243). Polar; 71°N - 44°N, 5°W - 133°W

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Arctic Ocean basin, from Finland (lapland) to eastern Siberia, Alaska, and Canada eastward to Mackenzie drainage. Belongs to Coregonus clupeaformis complex (Ref. 27547).

Lengte bij maturiteit / Grootte / Gewicht / Leeftijd

Maturity: L_m ?, range 17 - ? cm
Max length : 50.0 cm SL mannelijk / geslacht onbekend; (Ref. 59043); common length : 32.8 cm TL mannelijk / geslacht onbekend; (Ref. 12193); max. gerapporteerde leeftijd: 14 Jaren (Ref. 12193)

Korte beschrijving Determinatiesleutels | Morfologie | Morfometrie

Dorsale stekels (totaal) : 0; Dorsale zachte stralen (totaal) : 11 - 13; Anale stekels: 0; Anale zachte stralen: 10 - 14; Wervels: 58 - 63. Distinguished by the gill rakers that are longer than 20% of the interorbital width, 19 to 25 gill rakers (with modal counts of 22 or 23), and a pronounced hump behind the head in adults (Ref. 27547). Adipose fin well developed, often larger in males; axillary process present in pelvic fins (Ref. 27547). Dark brown to midnight blue above fading to silver on sides and wide beneath; no parr marks in young (Ref. 27547).

Inhabits coastal waters near shore (Ref. 5723), lower reaches of rivers with slow current, large lakes with tributaries, floodplain lakes, deltas and estuaries, brackish waters (Ref. 59043). Migrates up to more than 1,200 km inland for spawning (Ref. 5723). Overwinters near river mouths (Ref. 5723). There are non-migratory freshwater populations. Adults feed mostly on mollusks, crustaceans and chironomid larvae (Ref. 28219).

Levenscyclus en paargedrag Maturities | Voortplanting | Spawnings | Egg(s) | Fecundities | Larven

Upstream spawning migrations may be extensive but some populations seldom venture far upstream and still others may never go to sea at all (Ref. 593). Mature adults migrate upstream as early as June to spawn in October. It is assumed that the young hatch in late winter and spring, subsequently moving downstream, to return as mature adults 4 to 6 years later (Ref. 27547).

Hoofdreferentie Upload your references | Referenties | Coördinator | Medewerkers

Kottelat, M., 1997. European freshwater fishes. An heuristic checklist of the freshwater fishes of Europe (exclusive of former USSR), with an introduction for non-systematists and comments on nomenclature and conservation. Biologia, Bratislava, 52/Suppl. 5:1-271. (Ref. 13696)

Status op de Rode Lijst van het IUCN (Ref. 130435)

Niet bedreigd (LC) ; Date assessed: 01 January 2008

CITES (Ref. 128078)

Not Evaluated

CMS (Ref. 116361)

Not Evaluated

Gevaar voor de mens

Harmless

Gebruik door de mens

Visserij: commercieel; Aquacultuur: commercieel

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Estimates based on models

Fylogenetische diversiteitsindex (Ref. 82804): PD₅₀ = 0.5000 [Uniqueness, from 0.5 = low to 2.0 = high].

Bayesian length-weight: a=0.00550 (0.00331 - 0.00911), b=3.24 (3.10 - 3.38), in cm Total Length, based on LWR estimates for this species & Genus-body shape (Ref. 93245).

Trofisch niveau (Ref. 69278): 3.3 ±0.2 se; based on diet studies.

Weerstandsvermogen (Ref. 120179): laag, minimale populatieverdubbelingstijd 4,5-14 jaar (tm=3-14; tmax=14; Fec=8,000).

Fishing Vulnerability (Ref. 59153): Moderate to high vulnerability (52 of 100).

Prijsklasse (Ref. 80766): Very high.

Coregonus pidschian (Gmelin, 1789)