Boiled full fat soybean (BSB) and defatted soybean meal (SBM) were used to substitute at 0, 10, 20, 30, 40, 50 and 60 percent for fishmeal protein in diets which contain similar protein and lipid levels at 35% and 10% respectively. The experimental diets were fed to triplicate groups of yellow catfish with an average initial weight of 3.39-3.50 g/fish for 8 weeks. There was no interaction between soybean products and substitution levels on growth performance and feed utilization (P>0.05) but, there were statistical diffecrences under the same factor. The groups of fish fed BSB Substituted diests had higher weight gain, specific growth rate, feed intake, feed efficiency, protein effciency ration and productive protein value than those of fish fed SBM substituted diets (P<0.05). Moreover, fish fed diets with BSM and SBM replacing 10% of fishmeal protein had good growth comparable to those fed the control diet while those fed 60% substituted diets had the poorest growth performance and feed intake. Both soybean products and substitution levels affected lipid and ash contents of fish however, body protein levels were not significantly different among treatments. In vivo protein digestibility of fish fed diets with BSB substituted for fishmeal was higher than those of SBM substituted diets with average values of 87.83+-1.07 and 83.35+-3.83% respectively. Replacing fishmeal at 10, 20, 30, 40 and 50% of Fishmeal protein did not cause significant differences in protein digestibility while 60% replacement showed the lowest level of digestibility (P<0.05)

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