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This study was conducted at University of Eldoret, Fisheries and Aquatic Science Department hatchery to investigate the effects of tank background colour on the hatching and survival performance of Nile tilapia (Oreochromis niloticus) fry in glass tanks. The experimental set up consisted of four treatments of blue, green, red and colourless tank backgrounds where 55 fertilized Oreochromis niloticus eggs were obtained and incubated. Tanks were closely monitored, cleaned with controlled feedingfatcat:4o6vqiwh4rc7zijo4riuzse2e4