Iwame trout

Variety of fish

The iwame trout or markless trout is a variety of salmonid fish inhabiting some freshwater systems of Japan. It is an intra-specific mutant morph of the masu salmon that is characterized by a lack of the lateral camouflage spots typical of juvenile salmon in most populations. The iwame is a stream-resident morph that does not migrate to the sea as adults. This morph is recessively inherited and occurs together with the standard phenotype in some populations.

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