In this experimental study we were designed five experimental diets with containing changeable concentration of five experimental diet was prepare by various concentration of Bitter gourd (Spirulina ) powder as.20g/kg(DA), 30g/kg(DB), 50g/kg (DC) and 100g/kg(DD). Diet Z is as control. The highest weight gain and specific growth rate values, at the end of the experiment. FCR and PER values were also recorded in fish fed DC (50g/kg of diet) and DD (100g/kg of diet). Fish fed Spirulina significant differences were recorded in the survival rate among groups best survival rate was found at DC and DD followed by D5 (p > 0.05).it clearly indicates that from 50 to 75 gram per kilo gram of bitter gourd work better than full concentration i.e.100 gram per kilogram of diet. Energy utilization (EU, %) were noted significantly good at DC and DD

KEY WORDS: Spirulina , Growth, Cirrhinus mrigala fingerling.