Effects of extrusion and inclusion level of soybean meal on diet digestibility, performance and nutrient utilization of gilthead sea bream (Sparus aurata)

The objective of this study was to evaluate the effects of soybean meal inclusion and treatment on the performance of two sizes of gilthead sea bream (small, 9 g and large 50 g mean initial weight). Seven diets were fed containing soybean meal, before (SBM) and after (SBMex) its extrusion, at increasing levels (0% as control and about 20, 30, and 40% for both soy forms used). For large fish effects on digestibility, as well as on trypsin...