Fig. 7

The intestinal histomorphometry of the intestine of non-supplemented O. niloticus or fed with BIO-ZnNPs-30 mg/kg, or BIO-ZnNPs-60 mg/kg supplemented diets for 8 weeks. A showed normal architecture of the proximal intestine. B Column histogram displaying the statistical analysis of the intestinal morphometric indices. Data were represented as Mean ± SEM. Values with a different letter superscript are significantly different between groups (ANOVA with post hoc Tukey test, *P (<0.05), **P (<0.01). ***P (<0.001)