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An algal astaxanthin feeding trial was carried out to investigate the effects of natural astaxanthin from Haematococcus pluvialis as feed additives on growth, pigmenting efficacy and antioxidant capacity in blood parrot ( Cichlasoma citrinellum × Cichlasoma. synspilum ). Tissue total antioxidant capacity (TAC), superoxide dismutase (SOD), catalase (CAT) and maleic dialdehyde (MDA) were chosen as measures of its antioxidant capacity. All fish which received an astaxanthin (from micro-algal H. pluvialis ) supplemented diet with 400 mg/kg of astaxanthin, after 50 days of feeding, the astaxanthin-fed fish displayed a pinkcolored skin and the control-fed fish displayed a grayish skin. For the growth, the weight gains of controlfed fish and astaxanthin-fed fish were 200% and 300%, respectively. Samples of skin and scales were used for analysis of total carotenoids and astaxanthin content, and fish feeding …