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The present study was designed to evaluate the use of spirulina (Spirulina platensis) as a replacement of different protein levels for Nile tilapia (Oreochromis niloticus) fingerlings. Spirulina was incorporated into four isonitrogenous and isocaloric diets at 0, 5, 10, 15 and 20% of the protein -based diet. The diets were fed to the fishat satiation twice a day for 56 days. The final weight gain, specific growth rate, protein efficiency ratio and survival rate of fish were significantly (p<0.05) higher for group of fish fed diet supplemented with 20% Spirulina platensis from diet protein. The lowest feed conversion ratio was obtained for group of fish fed 20% Spirulina. There was a significant difference (p<0.05) in protein and lipid in carcass proximate composition of the fish fed on diet replacement with 20% spirulina from diet protein compared to those on the experimental groups. Moreover, fish fed diets containing different spirulina levels exhibited higher protein, serum creatinine, urea, albumin, globulin, triglycerides HDL-C values. On contrary, significant (P<0.05) decreased was observed for Albumin /Globulin Ratio, LDL-CAST, ALT and AST values compared with the control. Serum protein (g/dl), creatinine (mg/dl), urea (mg/dl) albumin (g/dl), globulin (g/dl) and triglycerides (mg/dl) values weresignificantly increased (P<0.05) with the increase of Spirulina levels being the highest at T4 (20% Spirulina/kg) diet. This study demonstrates that up to 20% of spirulina replacement was most effective in stimulating fish growth for Nile tilapia (Oreochromis niloticus) fingerlings.

GROWTH PERFORMANCE OF NILE TILAPIA (Oreochromis niloticus) FINGERLINGS FED DIET SUPPLEMENTED WITH DIFFERENT OF SPIRULINA PLATENSIS LEVELS