| Sumario: | Aquaculture is facing a challenge in order to search new alternative nutritional sources to generate highlydigestible and profitable diets for aquaculture species. In addition, the understanding of changes in digestivecapacity in fish species with aquaculture potential is of relevance importance, as the capacity of assimilationof different nutrients may change during the juvenile development of the species. Numerous research hasbeen focused on understanding the changes and adaptations of the development and capacities of the digestivesystem during the early ontogeny of fish, minimizing the importance of possible changes during juvenileontogeny, as a trigger for the grow-out efficiency increase in fish culture.Thus, few studies address the digestive changes during juvenile fish ontogeny and their implications in theability to assimilate different nutritional sources, considering that there should be no changes during thisstage, which in general represents the period of grow-out until commercial size, prior to their reproductivestages.The present work deals with the importance to characterize changes the digestive capacity during grow-out onthe spotted rose snapper (Lutjanus guttatus). Comparative studies of juvenile sizes of the species (20 to 400grams) have shown existence of changes in the optimum alkaline protease activity, as well as a diversificationand increase in the number of digestive enzymes of the alkaline phase in relation to juvenile ontogeny,resulting in
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