In our study, the larvae of the phantom midge was scarcely represented (72 organisms) compared to other studies in tropical freshwater bodies (Arcifa 2000). Records from Colombia (Ramirez et al. 1989) showed a high vertical migration capacity of this taxon especially during night. This larva shows a typical behavior that consists of staying at the bottom during the day and ascending to the surface during night (Lopez and Zoppi de Roa 2005).