The present study examines the hypothesis that the species (Rhinoptera bonasus and R. brasiliensis) co-occur in the early stages of young-of-the-year (YOY), forming heterospecific groups (congener) that are tactic-adopted, which would increase their chances of survival during the first weeks/months of life. Thus, we believe that this work contributes to a better understanding of this species, which can be useful in others studies, providing data on patterns of migration and habitat use.