Fig. 5

Representative photomicrograph of Nile tilapia intestine. The fish were fed with the control diet or diets containing N. oculata at 5% or 10% for 7 weeks. A Control intestine shows normal histological appearance of intestinal villus (vi) and lamina propria (lp). B Intestine of tilapia fed on N. oculata at 5% showing normal intestinal architecture with minimal intestinal vacuolation (v). Intestine of tilapia fed on N. oculata at 10% shows (C) Normal histological intestinal mucosa, and (D) Other section with minimal intestinal vacuolation (v). H&E, 400X