Fish flesh can run the gamut from ruby red (yellowfin tuna) to electric blue (lingcod), and NPR's The Salt blog has a handy explainer on the reasons behind those vibrant colors.
Yellowfin tuna, for example, is the "Michael Phelps of the fish world," and needs a lot of oxygen to go to its muscles. A protein called myoglobin stores that vital oxygen and also serves as a pigment, making the flesh pinkish red. "It's true of land animals, too: If they're walking around a lot, they'll have more myoglobin and their meat will be darker," says zoologist Bruce Collette.
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