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Originally Posted by jinx
But isn't the food dye used because trout is lacking in natural salmon coloring?
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Yeah something in their diet/lifestyle is missing, hence the food dye. Th esame is true of pink flamingos, in the zoo they feed them stuff to make them stay pink since they are missing whatever it is in the wild that gives them pinknitude. Also poison dart frogs in captivity lose their poison since they aren't eating whatever it is that makes them poisonous.