Abstract: We describe the allometric growth patterns of Hyphessobrycon serpae (Serpae tetra) larvae raised under aquarium conditions from hatch to day 30 (metamorphosis). Allometric growth patterns of some morphometric characters (total length, head length, trunk length, tail length, body depth, pre-anal myomer length, post-anal myomer length, pre-anal length, eye diameter and snout length) were modeled by a power function and were described by the growth coefficient.