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Longan seed is a by-product of processing longan that has high nutritional remaining. These nutrients are possibly used for growth development in fish. To study the effects of longan seed meal (LSM) as a potential feed ingredient in fish, LSM was used in tilapia experimental diets by replacing protein from broken rice meal with varying levels from 0, 5, 10, 25, and 50 % (LSM 0-50 %). All experimental diets were iso-nitrogenous and iso-lipidic diets. Feeding was given ad libitum for 8 weeks. Tilapia (initial body weight = 130.45±0.19 g/20 fish) was raised in approximately 100 L glass tank with a stocking density of 20 fish for each replication. The results of the present study showed that tilapia fed with diet containing 25 % LSM had the highest weight gain, average daily gain, specific growth rate, feed intake, feed conversion efficiency, feed efficiency, protein efficiency ratio, and protein productive value. In addition, fish fed diet containing 25 % LSM had the lowest feeding cost. Taken together, these results indicate that dietary 25 % LSM replacement is a potential level for using as a novel feed ingredient for Nile tilapia diet.
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