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vol-31USE OF SOYBEAN MEAL AND/ OR CORN GLUTEN MEAL AS
PARTIAL SUBSTITUTES FOR FISH MEAL IN NILE TILAPIA
(OREOCHROMIS NILOTICUS) FINGERLING DIETS
EL-SAYED HASSAN EL-EBIARY
National Institute of Oceanography and Fisheries, Qayed Bay Anfoshy, Alexandria, Egypt.
Keywords: Soybean meal, gluten meal, fish meal, tilapia, growth performance, feed utilization.
ABSTRACT
This experiment was conducted to evaluate both soybean meal (SBM) and corn gluten
meal (CGM) as alternative dietary protein sources for fishmeal in Nile tilapia (Oreocromis
niloticus) fingerlings. Fish with an average initial body weight of 4.35 ± 0.04 g were
stocked into ten glass aquaria (100 X 30 X40 cm). Each tank contains 100 liters of
freshwater and was stocked with ten fish. Five iso-nitrogenous diets (30%crude protein)
containing different levels of SBM and CGM, (25 or 50%) were fed two times daily, 6 days
a week for 70 days. Fish Growth rate, feed conversion ratio (FCR), protein efficiency ratio
(PFR), protein productive value (PPV) and energy utilization (EU) were deteriorated with
increasing both of SBM and CGM at 50% in the tested diets for tilapia (Oreocromis
niloticus) fingerlings. Fish fed the diets supplemented with either CGM or SBM at 25% FM
substitution level were not statistically different from those of fish fed the control diet
(containing 40% fish meal (FM) as a sole protein source). Body compositions of various
experimental fish were significantly affected (P< 0.05) by dietary treatments. Body water
and body lipid were positively correlated (P< 0.05) with SBM and GM dietary inclusion
level from 25% to 50 % in the tested diets, while both body protein and ash content showed
negative relationship (P< 0.05). Survival rate of fish ranged from 90 to 100%, suggesting
that up to 25% of fish meal protein can be replaced with either SBM or CGM in the diet of
tilapia (Oreocromis niloticus) fingerlings, without affecting fish growth or nutrient
composition.
