Sustainable fish feeds: optimization of levels of inorganic fertilizers for mass production of Oocystis sp. for climate smart aquaculture

Use of microalgae as a source food in aquaculture production is gaining recognition due to their rapid growth rate that promises high biomass generation within short time. The challenge faced getting good and inexpensive nutrients be used mass the required microalgae. This study investigated effect different nutrient combination influencing green algae Oocystis sp. which has been identified possible protein for raising Orechromis niloticus fingerlings fish farming. Modified Bolds 3 N Medium commercial agricultural fertilizers (urea, NPK DAP) media were compared establish appropriate combinations would result into but at lowest cost possible. Bold acted control, 11.28 KSh per litre; other derived from urea, NPK, DAP (varying ratio each) treatment 1 (0.14 litre), 2 (0.18 (0.22 litre). was cultured 5 weeks with samples taken daily analyses using chloropyhll-a concentration surrogate 30 days, each determined. rate, doubling time, divisions day then estimated based on this chlorophyll-a concentration. results showed mean concentrations highest (7.715 ± 0.667 µg/ml), while (6.441 0.555 µg/ml) had least. There no significant differences four treatments (Kruskal–Wallis H test: P > 0.05). varied significantly time < 0.001). difference 0.05), 0.05) treatments. inorganic can cost-effective scale culture