Abstract
Pepsin-like, trypsin-like and amylase activities in the gastrointestinal tissue and their digesta were assayed at 3 and 6h interval after feeding a diet flavoured with alanine, glycine, proline, his-tidine and uridine-5'-monophosphate on the initial day, day 13 and final feeding day of the experi-ment. Eel reared on the flavoured diet for 25days showed remarkably high growth, feed efficiency and energy retention compared with the control group. Although a similar change was recognized in gastric digesta weight of both groups, the flavoured group had significantly higher pepsin-like activities in gastric digesta than the control group, A significant positive correlation between the intestinal digesta weight and trypsin-like activities and high digestibility of dietary protein and carbohydrate were observed in the flavoured dietary group. Whereas higher trypsin-like and amylase activities and digesta weight in intestinal tract were determined in the control group, no rela-tionship between intestinal digesta weight and their trypsin-like activity was recognized. These findings suggest that the feeding stimulants in the diet, stimulates the feeding activity of the fish and promotes the digestion and absorption of the diet.
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