The Kamchatkan rainbow trout (''Oncorhynchus mykiss mykiss'') is a
subspecies of the
rainbow trout, which is a
fish
Fish are aquatic, craniate, gill-bearing animals that lack limbs with digits. Included in this definition are the living hagfish, lampreys, and cartilaginous and bony fish as well as various extinct related groups. Approximately 95% of ...
in the family
Salmonidae
Salmonidae is a family of ray-finned fish that constitutes the only currently extant family in the order Salmoniformes . It includes salmon (both Atlantic and Pacific species), trout (both ocean-going and landlocked), chars, freshwater whitefis ...
. It is native to
Russian Far East
The Russian Far East (russian: Дальний Восток России, r=Dal'niy Vostok Rossii, p=ˈdalʲnʲɪj vɐˈstok rɐˈsʲiɪ) is a region in Northeast Asia. It is the easternmost part of Russia and the Asian continent; and is admin ...
. Its main range is on the
Kamchatka Peninsula
The Kamchatka Peninsula (russian: полуостров Камчатка, Poluostrov Kamchatka, ) is a peninsula in the Russian Far East, with an area of about . The Pacific Ocean and the Sea of Okhotsk make up the peninsula's eastern and w ...
, and it has also been recorded from the
Commander Islands
The Commander Islands, Komandorski Islands, or Komandorskie Islands (russian: Командо́рские острова́, ''Komandorskiye ostrova'') are a series of treeless, sparsely populated Russian islands in the Bering Sea located about ea ...
east of Kamchatka, and sporadically in the
Sea of Okhotsk, as far south as the mouth of the
Amur River.
Size
This species reaches a length of .
Sea-run and freshwater ecotypes
The Kamchatkan rainbow trout ("mikizha") comprises various ecological forms, including
anadromous and resident freshwater forms and their intermediates.
[ Russian taxonomy has long attributed the rainbow trout to the genus ''Parasalmo'', and has further considered the Kamchatkan rainbow trout as composed of two distinct species, ''Parasalmo mykiss'' and ''Parasalmo penshinensis'', whose ranges overlap. ''P. mykiss'' is a resident freshwater and estuary form, whereas ''P. penshinensis'', "Kamchatkan salmon", is the sea-run, migrating anadromous form, which may grow to a length of 100 cm and 11–12 kg weight (as with the American ]steelhead
Steelhead, or occasionally steelhead trout, is the common name of the anadromous form of the coastal rainbow trout or redband trout (O. m. gairdneri). Steelhead are native to cold-water tributaries of the Pacific basin in Northeast Asia and ...
).[ ''P. penshinensis'' is considered critically endangered (CR) in the Red Book of Kamchatka.][Красная книга Камчатки. Том 1. Животные]
(Red Book of Kamchatka)[ Modern research however suggests that the two forms represent the same species, showing no genetic isolation or differences.]
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Позвоночные животные России sevin.ru
References
Oncorhynchus
Fish described in 1792
Taxa named by Johann Julius Walbaum
{{Salmoniformes-stub