The Purpose of this Study is to comprehend and compare the quickness of astaxanthin and canthaxanthin in improving ranchu goldfish color. The ability of carotenoids to be digested and absorbed depends on the structure. Carotenoids that quickly improve color quality are desirable. In this work, goldfish were fed one to three diets for 30 days to determine the effects of astaxanthin and canthaxanthin on color enhancing, growth and survival rate. The experiment consisted of (A) an unsupplemented control, (B) astaxanthin (carophyll pink 100 mg / kg), and (C) canthaxanthin (carophyll red at 100 mg/kg). Samples of dorsal skin were observed and measured via TOCA Color Finder (TCF) each day. The best colour result was obtained by canthaxanthin, but our work revealed that growth and survival rates are not significantly different among the groups.
 Yeşilayer, N., Aral, O., Karsli, Z., et al. The Effects of Different Carotenoid Sources on Skin Pigmentation of Goldfish (Carassius auratus). The Israeli Journal of Aquaculture 2011, 63, 9 pp.
 Yuangsoi, B., O. Jintasataporn, P. Tabthipwon, dan C. Kamel. 2010. Utilization of carotenids in fancy carp (Cyprinus carpio): astaxanthin, lutein and carotene. World Applied Science Journal 11(5): 590-598
 Stachowiak B. Astaxanthin synthesis by yeast xanthophyllomyces dendrorhous and its mutants on media based on plant extracts. Indian J Microbiol. 2012; 52: 654-659. doi:10.1007/s12088-012-0306-7
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