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Author: Linnaeus, 1758

Coregonus lavaretus Linnaeus, 1758

Diagnosis: body fairly deep, head relatively small, snout prominent and projecting well beyond tip of lower jaw, the upper jaw short and usually not reaching back beyond front margin of eye; mouth almost toothless. Gillrakers 22-29. Dorsal finrays iii-iv 9-13, anal finrays iii-iv 11-14. Scales moderate, 84-100 in lateral line. Colour: back bluish or blue/green, flanks silvery; tips of snout and dorsal fin blackish. Size: to 57 cm.

Habitat: anadromous forms estuarine, rarely in fully saltwater; many freshwater forms and populations. Food: planktonic crustaceans, or larger benthic crustaceans in brackish water. Reproduction: migratory forms ascend rivers in summer, but mainly in autumn; spawning in autumn or winter, depending on form and population.

Distribution: south-eastern North Sea and Baltic, also south-eastern Barents and White Seas.

Subspecies

C. Iavaretus lavaretus: gillrakers 22-29 (mean 25), usually smooth; Gulf of Finland and Gulf of Bothnia.
Eggs, larvae and young stages. Nüsslin, 1908: 77, fig. 2.
Otoliths (sagitta). Fryd, 1901: 33 | Scott, 1906: 76, pl. IIB (fig. 25-27), pl. V (fig. 29).

C. Iavaretus mediospinatus Pravdin: gillrakers 27-40 (mean about 35), mostly with denticulations; Gulf of Finland.
Eggs, larvae and young stages. No data.
Otoliths (sagitta). No data.

C. Iavaretus pallasi Valenciennes: gillrakers 39-48 (mostly 42-44), usually with minute denticulations; Gulf of Finland.
Eggs, larvae and young stages. No data.
Otoliths (sagitta). No data.

C. Iavaretus oxyrinchus Linnaeus: gillrakers 35-44 (usually 40), snout pointed; western Baltic and south-eastern North Sea.
Eggs, larvae and young stages. Nüsslin, 1908: 177, fig. | Schnakenbeck, 1936: 672, fig. 7-8.
Otoliths (sagitta). Fryd, 1901: 33.

C. Iavaretus pidschianoides Pravdin: gillrakers 21-33 (usually 25-26), lower jaw about equal to caudal peduncle depth; south-eastern Barents and White Seas.
Eggs, larvae and young stages. No data.
Otoliths (sagitta). No data.

Houting (Coregonus lavaretus)