alpha-Amylase activities of Aspergillus oryzae grown on dextrin or indigestible dextrin were 7 center dot 8 and 27 center dot 7 U ml(-1), respectively. Glucoamylase activities of the cultures grown on dextrin or indigestible dextrin were 5 center dot 4 and 301 mU ml(-1), respectively. The specific glucoamylase production rate in indigestible dextrin batch culture reached 1 center dot 35 U g DW(-1) h(-1). In contrast, biomass concentration of A. oryzae in indigestible dextrin culture was 35% of that in dextrin culture. Thus, the culture method using indigestible dextrin has the potential to improve amylolytic enzyme production and fungal fermentation broth rheology.