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Pygmy whitefish
The pygmy whitefish (''Prosopium coulterii'') is a freshwater whitefish of the genus ''Prosopium'' in the family Salmonidae. Found in the mountain streams and lakes in western North America, it also has isolated populations in Lake Superior and in Ekityki Lake, Chukchi Peninsula.
== Description ==
The pygmy whitefish is a small herring-like fish with a long and cylindrical body by comparison to other whitefishes.〔 Silvery in colour, it has a brownish back, and a whitish belly.〔Becker, 1983, pp. 369–371〕 Black spots on the side called "parr marks", which are present on young trout or "parrs", are present on the young of this species, and on adults in some Alaskan populations.〔 Commonly ranging from in length,〔 it is typically long,〔Hubbs et al., 2004, p. 156〕 and reaches a maximum length of .〔Froese and Pauly, 2010〕 It is identified by its small size, and its large eye, which has a greater length than its blunt snout.〔Page and Burr, 1991, pp. 45–46〕 Its dorsal fin and pectoral fin are usually clear, and its tail is clear with a faint dark spot. Its anal fin and pelvic fin are plain whitish.〔 It has large scales with only 56–70 on its lateral line, fewer gill rakers, all characteristics that indicate a degree of differentiation from the other ''Prosopium'' fishes.〔 Because of this, it is considered an early offshoot (basal) species in its genus,〔 and it is the most trout-like member of a genus considered the most trout-like and primitive whitefish group.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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