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A feeding experiment was conducted to examine the effect of several ingredients incorporated in diets as binders on the growth, feed efficiency, and digestive enzymes'activities of fingerling Japanese flounder Paralichthys olivaceus. Carboxymethylcellulose (CMC), gelatinized potato starch (a-starch), and wheat gluten were separately incorporated in flounder diets as binders at the 5% level. These diets were fed to flounder with an initial mean weight of 15 g for 4 weeks at 20°C. Weight gain, feed efficien cy, and protein retention of the fish fed a diet containing CMC were significantly inferior to those of the fish fed diets containing a-starch or wheat gluten. Apparent digestibility of protein in the diet contain ing CMC was also significantly lower than the diet containing wheat gluten. After the 4-week feeding trial, proteolitic and lipolitic enzyme activities were measured with the homogenates of stomach or intes tine. Proteolitic enzymes' activities such as pepsin-like and trypsin-like were lower in the fish fed the diet containing CMC than those in the fish fed the diets containing a-starch or wheat gluten, and espe cially trypsin-like activities at 4 to 12 hours after feeding were significantly lower. These results suggest that a-starch and wheat gluten are suitable as binders for fingerling flounder diets compared with CMC because CMC inhibits the proteolitic enzymes' activities in digestive tracts.

fisheries science

Effect of Carboxymethylcellulose &amp;alpha;-Starch, and Wheat Gluten Incorporated in Diets as Binders on Growth, Feed Efficiency, and Digestive Enzyme Activity of Fingerling Japanese Flounder