Kohaku koi (Cyprinus carpio) is one of the fancy koi that has a high price. Red color intensity of kohaku determines its market price. This study was performed to verify the effect of Spirulina platensis supplementation in diet with different dosages (1. 3 and 5%) on red color intensity of kohaku koi. https://danddcollectiblers.shop/product-category/fall-entertaining/