ABSTRACT
Feed greatly affect the growth and health of fish, can also serve to increase the color intensity value. Spirulina flour and Marigold flower meal contain beta carotene which plays an important role as a source of natural carotenoids. This research aims to obtain the optimal combination of Spirulina flour and Marigold flower meal in commercial feed that increases the highest color increase in swordtail fish. The method used was an experimental laboratory with a completely randomized design consisting of five treatments and three replications. The parameters observed included the intensity level of fish color, growth in absolute weight, survival rate and air quality. The results of the research showed that the optimum concentration to provide the highest increase in color intensity value in Swordtail fish were the addition of 4% Spirulina flour and 0.6% marigold flower meal in commercial feed. This concentration gave the highest increase in color intensity values, of 7.00 on the head and 8.37 on the tail, the highest absolute weight growth of 1.71g, survival rate of 100% and the value of water quality parameters, namely temperature 26°C, DO 4.33-5.87 mg/l and pH 7.27-7.90.
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