What is Blue rainbow trout (Cobalt masu)?

a photo of Blue rainbow trout
Blue rainbow trout are an angler’s dream.

The Japanese name for the blue rainbow trout is Cobalt masu, derived from its blue body color. Blue rainbow trout is a mutation in the hatchery production of rainbow trout. This fish lacks the middle lobe of the pituitary gland. This resulted in blue body color. This rare genetic glitch has occurred only in rainbow and brown trout. It is said that one blue rainbow trout is born for every ten of thousand rainbow trout. This trait is inherited recessively. It does not reproduce and is susceptible to disease. Therefore, although it has a beautiful body color, it is difficult to produce in large numbers.

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Revision date: April 8, 2023


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