Fig. 1. Intestinal histology from juvenile giant grouper fed the FM100 (a), FM80 (b), FM60 (c), and FM20 (d) diets for 12 weeks. A progressive loss of overall tissue integrity and changes in
the width/heights of the mucosal folds (MF), loss of supranuclear vacuoles (SNV), slight widening of the sub-epithelialmucosa (SM), abundance of goblet cells (GC) and gradual widening
of the lamina propria (LP) can be seen with increasing level of FM replacement. Arrows are used to indicate specific cell structures (H&E, 200×).