This study aimed at evaluating raw dried Enteromorpha intestinalis to replace partially
soybean meal in the diet of Nile tilapia Oreochromis niloticus fry. For 90 days fish fry were fed diets
containing 0, 15 and 30 % replacement of soybean meal with the dried seaweed by weight, the
replacement represented an equivalent to 0, 3.1 and 6.2 % soybean protein replacement. Results
showed that survival for all treatments were statistically similar, quite high (93 – 96 %) and were
independent of dietary treatment (P>0.05). Weight gain, specific growth rate and feed intake of O.
niloticus fry fed on diet containing 15 % replacement were snot significantly different (P>0.05) with
those fed with the control diet. Feed conversion ratios (FCR) of tilapia fed the experimental diets were
excellent (1.0 - 1.1) and were not significantly different (P≥0.05) from each other. It is concluded that
15 % replacement by weight of soybean meal with the raw dried E. intestinalis in the Nile tilapia fry or
fingerling diet could be used to lessen the cost of the formulated feeds since it did not have any adverse
effects on growth, nutrient utilization and body composition of the fish.