Specific Features of Nutrient Transport in the Digestive Tract of Fish

The review briefly addresses the mechanisms underlying micro- and macromolecular transport of proteins, fats and carbohydrates in the fish intestines. A special focus is on the differences between some mechanisms of micromolecular transport of peptides, amino acids and hexoses, as well as craniocaudal transport gradients, in fish compared to mammals. Transport proteins emerge at the earliest stages of fish ontogenesis, before the transition of fish larvae to exogenous feeding. The reasons behind the differences in the intestinal transport systems are analyzed.