A step toward a biofloc system with no‐carbon addition: Increasing dietary lipid level enhances the water quality and body chemical composition without affecting tilapia health status

A 70-day experiment was carried out to evaluate biofloc system operation with no carbon addition by manipulating dietary protein and lipid levels for Nile tilapia (Oreochromis niloticus) cultivation. Three treatments were conducted; Control treatment (C; fed on a 30% crude [CP] diet supplemented 3% vegetable oil [VO] + of external source [ECS] in rearing tank), low protein–low (LPLL; 23% CP (VO) ECS) protein–high (LPHL; 9% VO ECS). The C recorded the highest values (p < 0.05) terms final body weight (FBW), specific growth rate, floc volume, total suspended solids, ammonia nitrogen. No significant differences observed between LPHL regarding FBW efficiency ratio. liver sections showed better histological alteration index compared control. It could be concluded that applying using diets may afford water quality conditions, limit environmental impact decrease costs limited effect fish performance.