Dietary impact of Spirulina platensis powder supplementation on the growth and immunity of Clarias gariepinus

North African catfish (Clarias gariepinus) is the second most consumed commodity, having a good nutritional and a high economic value. The increased consumption of C. gariepinus and the lack of availability on the market requires an intensive cultivation. However, the intensive cultivation can reduce water quality which can interfere with fish growth and immunity. To overcome this problem, it is necessary to add immunostimulants and growth promoters to increase fish productivity. One of the natural ingredients that can be used is Spirulina platensis flour, which is given through feed. This research was carried out from February to May 2022 at the Aquaculture Wet Laboratory, Karangsari Biofloc Pond, using an experimental method of Completely Randomized Design with 3 treatments and 1 control, each repeated 4 times. The treatments were a supplementation of spirulina powder mixed into the feed with different doses, namely T1 20 g kg-1 feed, T2 30 g kg-1 feed, and T3 40 g kg-1 feed, and T0 as a control. The observed parameters were the final weight and length growth, the immunity, consisting of haematocrit and leukocrit percentages, and the visceral organs, including HSI and VSI. The data obtained were analysed using ANOVA, at the 95% confidence level, to determine whether the difference was significant or not. If there was a significant difference, then it was proceeded with the DMRT test (Duncan Multiple Range Test). The results of data analysis showed that the addition of spirulina flour through feed had a significant effect (p