What causes Sockeye salmon flesh to be intensely deep red, contrasting with Keta?

Answer

Consumption of krill and small crustaceans rich in astaxanthin

Sockeye salmon eat krill and small crustaceans rich in astaxanthin, the pigment responsible for the vibrant red color, which Keta salmon consume less of.

What causes Sockeye salmon flesh to be intensely deep red, contrasting with Keta?
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