This study was conducted to evaluate blends of alternative protein sources (Gliricidia and Moringa leaves) as fishmeal supplements in the diets of Nile tilapia (Oreochromis niloticus) fingerlings. 5 experimental diets containing 30% crude protein were formulated as Fish Meal/Soybean (FMS, control), Fish Meal/Moringa (FMM), Fish Meal/Gliricidia (FMG), Fish Meal/Soybean/Moringa (FSM) and Fishmeal/Soybean/Gliricidia (FSG) and fed to oreochromis niloticus fingerlings for 10 weeks. A total of 150 fingerlings were distributed into 15 plastic tanks in triplicates with 10 fish per tank. The findings showed that whereas fish given diets FMS, FMM, and FMG saw similar weight gains, fish fed diet FSM experienced weight gains that were significantly different (P<0.05) from those of the other experimental fish. However, the experimental fish's Specific Growth Rate (SGR) did not change significantly (P>0.05).
Fish fed diet FSG had a Feed Conversion Ratio (FCR) of 1.12 ± 0.01, while fish fed diet FMG had an FCR of 1.23 ± 0.02. There were no appreciable variations in the experimental fish's Protein Efficiency Ratio (PER) value (P>0.05). The fish utilized the experimental meals effectively overall. According to the study's findings, Nile tilapia’s diet could be supplemented with various protein blends in addition to fishmeal.