Longfin Serpae Tetra

Serpae Tetras originate from the Amazon basin, inhabiting the Guaporé and Paraguay River basins in Argentina, Brazil, and upper Paraguay. Most specimens currently sold in the aquarium trade are captive bred rather than wild-caught; the species is not endangered. In the wild, this species prefers still and slow-moving backwaters such as lakes, ponds, and streams. They often congregate around tree roots and thick vegetation where they can find both safety and food.

This species is part of a group known as Blood Tetras, referring to their red coloration. Considerable confusion and debate have continued over species within this group, as they have strong similarities, and the study of its taxonomic status continues. They are very similar to, but not identical to, Hyphessobrycon swegles, also called the Red Phantom Tetra.