An Evaluation of Wolffia Meal (Wolffia arrhiza) in Replacing Soybean Meal in Some Formulated Rations of Nile Tilapia (Oreochromis niloticus L.)
2001
N. Chareontesprasit | W. Jiwyam
An investigation on the evaluation of Wolffia meal being used as a replacement material for soybean meal in ration of Nile tilapia (Oreochromis niloticus) was carried out at Khon Kaen University, Khon Kaen 40002, Thailand. The two experiments were laid in a randomized complete block design with three replications and they were carried out in a laboratory. The results showed that digestibility of fresh Wolffia by Nile tilapia fingerlings (2.5 g) and Nile tilapia adults (40-50 g) were not significantly differed from each other. Growth performance of Nile tilapia adults with respect to percentages of weight, length, feed intake, feed conversion ratio, protein efficiency ratio, net protein utilization and specific growth rate were not statisticaly significant in all levels of Wolffia. However, the highest total production occurred in fish being fed on formulated ration containing 15% Wolffia meal. An increase in Wolffia meal beyond 15 % in the formulated ration decreased the survival rate and total production of the cultured fish. Wolffia meal could be successfully used in place of soybean meal but the amount being used should not exceede 15 %.
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