5 | CONCLUSION
Taken together, the digestive enzymes activities, intestinal morphology, and intestinal microbiome composition and diversity of fish are significantly affected by feeding habits. Accordingly, carnivorous fish possess higher trypsin and lipase activities related to their higher feeding habit on protein and lipid. On the contrary, herbivorous fish species utilizes plant materials related to the higher amylase enzyme activity. The intestinal microvilli of carnivorous fish had many branches and complex structures to increase surface area for digestion and absorption of digested nutrients as an adaption to the short intestine. The feeding habits led to various adaptations of microbiota related to the selective colonization for various biological functions. The results provide an understanding of the different digestive strategies of omnivorous, carnivorous, herbivorous and filter-feeder fish to improve feed formulation for better feed utilization and digestibility in order to enhance nutrient absorption for promoting growth performance.