All I can add to the above post is that there are many ways to produce animals that are lighter in color than normal. FWIW, andalusian in chickens is caused by a codominant mutant gene that produces "blue" birds when heterozygous and combined with an independent black mutant. AFAIK, palomino in horses is caused by a codominant mutant. And there are other more or less dominant mutants that lighten the color in other species. So salmon is not unique.

Paul Hollander

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