↑ “Pigments in Salmon Aquaculture: How to Grow a Salmon-colored Salmon”. Bản gốc lưu trữ ngày 13 tháng 10 năm 2007. Truy cập ngày 26 tháng 8 năm 2007. Astaxanthin (3,3'-hydroxy-β,β-carotene-4,4'-dione) is a carotenoid pigment, one of a large group of organic molecules related to vitamins and widely found in plants. In addition to providing red, orange, and yellow colors to various plant parts and playing a role in photosynthesis, carotenoids are powerful antioxidants, and some (notably various forms of carotene) are essential precursors to vitamin A synthesis in animals.
