Acestrorhynchus lacustris
Acestrorhynchus lacustris is a species of freshwater ray-finned fish belonging to the family Acestrorhynchidae, the freshwater barracudas. It was described by Christian Frederik Lütken in 1875, originally under the genus Xiphorhamphus. It inhabits the São Francisco and Paraná River. It reaches a maximum standard length of.
A. lacustris spawns between July–March.