Abstract: This study was carried out to determine the effects of Spirulina platensis on the growth and survival rate in Angel fish (Pterophyllum scalare) as a protein source in a 2 months feeding trial. S. platensis was added to the basal diet at 0% (control), 5, 1 and 20% and fed to Angel fish (Pterophyllum scalare). The growth of Angel fish (Pterophyllum scalare) was related to the level of S. platensis containing. The final weight gain, specific growth rate, feed conversion ratio of fish were affected by spirulina supplementation (p>0.05). The highest Feed Conversion Ratio (FCR), 1.24±0.79 was found in the fishes that were cultured with 5% of S. platensis. The survival rate was not affected by different amount of spirulina. The results of the present study, clearly show that S. platensis could be considered as a protein source for incorporation in Angel fish (Pterophyllum scalare) diets to gain more weight.