Effectiveness of fermented and unfermented Chara corallina on growth ferformance and digestive enzyme activities in Giant Freshwater Prawn (Macrobrachium rosenbergii de Man 1879).

Results showed the average daily growth, specific growth rate, feed conversion ratio, protein efficiency ratio, and survival rate were not significantly different among the treatments (p>0.05). The highest survival rate was observed in the prawn fed a diet containing 30.0 % fermented Chara corallina added. Non-fermented C. corallina at 7.5% and 15.0% were significantly increased protease and cellulase activities, while both fermented and non-fermented forms led to a reduction in amylase activity. No significant changes were observed in lipase activity across all supplementation levels and forms. There was no significant interaction between algal fermention and inclusion levels on growth and survival rate (p>0.05). However, a significant interaction was found for protease, amylase and cellulase of freshwater prawn (p<0.05). According to this study, it can be concluded that C. corallina has the potential to substitute soybean meal protein in the diet of M. rosenbergii.