Effects of spirulina Spirulina platensis meal as a feed additive on growth performance and immunological response of Gangetic mystus Mystus cavasius

The aim of this study was to investigate the effects of dietary Spirulina platensis supplementation on the growth and immunity of Mystus cavasius. Fish were fed on the experimental diets, where the fish meal was replaced with S. platensis meal at 0%, 2.5%, 5.0%, 7.5%, and 10% levels, respectively. Triplicate groups of fish were fed with each diet twice a day near satiation and reared for 10 weeks. After the trial, serum lysozyme levels, whole-body composition, feed utilization, growth performance, and blood characteristics were examined. The pathogenic Aeromonas hydrophila was administered intra-peritoneally to 10 fish from each group and monitored for daily mortality rate. Metagenomics analysis was used to investigate the gut microbiota. When more than 7.5% of fish meal…