IMPROVEMENT OF FEED-INTAKE THROUGH SUPPLEMENTATION WITH AN ATTRACTANTMIX IN EUROPEAN SEA-BASS FED PLANT-PROTEIN RICH DIETS

The incorporation of an attractant mixture by substitution of an equiv alent amount of basal dietary mixture was studied in terms of feed int ake and growth performance in European seabass juveniles (mean initial weight : 17 g) fed plant-protein rich diets during 21 days. Three die ts had as main protein sources; fish meal, or one of two soy protein c oncentrates (S and E). To the basal mixture of these last two diets, a s well as to a corn-gluten based diet, an attractant amino acid mixtur e was added at a 2.5% level. Daily feed intake was measured throughout the experimental period. Feed intake and weight gain were highest in seabass fed the fish meal based diet. In those fed the soy protein con centrate diets, the addition of the attractant mixture improved growth significantly; voluntary feed intake and feed efficiency were also am eliorated in these groups. In terms of growth, feed intake and protein utilisation, lowest values were found in fish fed with the corn-glute n rich diet, supplemented with the amino acid mixture.