author(s)
Nilima Priyadarshini, Dinesh Kaippilly and Marco Saroglia

abstract
The present study was carried out to examine the specific digestive enzyme activity of Nile tilapia (Oreochrmis niloticus) fingerlings, fed with different percentages of Guar sprout meal (GSM). The experiment was set with five isonitroneous and isolipidic diets as T₁, T₂, T₃, T₄ and T₅ containing guar sprout meal at an inclusion rate of 0, 25, 50, 75 and 100%, respectively. The result showed a higher protease activity in the fish nourished with 0%, 25% and 50%. GSM beyond 50% showed poor protease activities especially in all parts of the gut (gastrointestinal tract). There was significant acceleration in amylase and lipase activities in the digestive tract (liver, stomach and intestine) with increased GSM levels. The results accomplish that 25-50% inclusion of GSM can be a favorable and economically sustainable protein source in the diet of Nile tilapia fingerlings.