Coregonus pidschian (Gmelin, 1789)
Humpback whitefish
Ledovitomorskje,  Polkur,  Ob' whitefish,  Pyzh'yan,  сиг сибирский,  сиг-горбун,  сиг-пыжьян
Coregonus pidschian
photo by Runfola, D.M.

Family:  Salmonidae (Salmonids), subfamily: Coregoninae
Max. size:  50 cm SL (male/unsexed); max. reported age: 14 years
Environment:  demersal; freshwater; brackish; marine, anadromous
Distribution:  Arctic Ocean basin, from Finland (lapland) to eastern Siberia, Alaska, and Canada eastward to Mackenzie drainage. Appendix III of the Bern Convention (protected fauna). Belongs to Coregonus clupeaformis complex (Ref. 27547).
Diagnosis:  Dorsal spines (total): 0-0; Dorsal soft rays (total): 11-13; Anal spines: 0-0; Anal soft rays: 10-14; Vertebrae: 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).
Biology:  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).
IUCN Red List Status: Least Concern (LC); Date assessed: 01 January 2008 Ref. (123251)
Threat to humans:  harmless
Country info:  Ranges from the Kara Sea to Siberia (Ref. 27547). Commercially important in Siberia (Ref. 28219). This has been translocated to areas within the country for stocking in open waters however, it failed to establish populations in areas where it has been transplanted to (Ref. 45022). Also Ref. 683, 43202, 55804, 96339. EurRus

Entered by: Froese, Rainer - 01.05.91
Modified by: Casal, Christine Marie V. - 13.07.10
Checked by: Casal, Christine Marie V. - 09.01.03

Source and more info: For personal, classroom, and other internal use only. Not for publication.

Page created by Jen, 05.08.02, php script by kbanasihan 06/09/2010 ,  last modified by sortiz, 10/02/17