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Author: Pallas, 1776

Coregonus autumnalis Pallas, 1776

Diagnosis: body moderately deep, head relatively small, jaws about equal, snout not prominent, tip of lower jaw not upturned, upper jaw reaching back to level of pupil; toothless. Gillrakers 35-51. Dorsal finrays iii-iv (9)10-12, anal finrays iii-iv 9-12 (13). Scales moderate, 86-111 in lateral line. Vertebrae 61-68. Pyloric caeca 113-183. Colour: anadromous adults with back brown to light green, flanks silvery. Size: to 50 cm and 2 kg, usually less than 40 cm and I kg.

Habitat: pelagic in brackish waters (salinity 20-22%o) of coastal regions and mouths of rivers and bays. Food: planktonic crustaceans, also fish fry; no feeding during upward migration. Reproduction: entering rivers in shoals from late June to late August according to locality, sometimes reaching far upstream; spawning in September and October, returning to sea in November after spawning; young descend in summer, mature at 6-8 years.

Distribution: coasts of north-eastern Barents Sea (entering rivers from Mesen to Pechora in Clofnam area). Elsewhere, coasts and rivers of Siberia and western arctic North America, also Lake Baikal (C. autumnalis migratorius).

Eggs, larvae and young stages. No data.
Otoliths (sagitta). No data.

Arctic cisco (Coregonus autumnalis)