This preliminary study should encourage to further investigate the potential of
prebiotics in fish compound diets. It should be necessary to improve the methods to
survey the effect of prebiotics on microbiota, while considering also their possible
effects on uncultivable and anaerobic bacteria. Preferably combined with probiotics,
some prebiotics like oligofructose could be useful for the establishment of a stable and
healthy gastrointestinal flora, especially in intensive larval culture where high
mortalities are frequently encountered.