Abstract
Information on the physiological basis for the relationship between feeding frequency and feed utilization could help establish more economic feeding practices in commercial aquaculture. Changes in activities in gastric protease, and pancreatic protease and amylase were determined at specific intervals after feeding. Unfed fish showed no significant changes in digestive enzyme activities but fish which were fed responded with increased digestive enzyme levels. The secretory response in Clarias gariepinus is more rapid than in carp and eels. Clarias gariepinus is physiologically equipped to cope with infrequent and irregular meals.
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