Astaxanthin is a red pigment occurring naturally in a wide variety of living organisms.
Most crustaceans, including shrimp, crawfish, crabs and lobster, are tinted
red by accumulated astaxanthin. The coloration of fish is often due to astaxanthin;
the pink flesh of a healthy wild salmon is a conspicuous example. In commercial
fish and crustacean farms, astaxanthin is commonly added to feeds in order
to make up for the lack of a natural dietary source of the pigment. Not only does
astaxanthin provide for pigmentation in these farmed animals, it also has been
found to be essential for their proper growth and survival.
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