Hyphessobrycon borealis is a species of freshwater ray-finned fish belonging to the family Acestrorhamphidae, the American characins. This fish is found in French Guiana and Brazil.
Hyphessobrycon borealis is commonly found in French Guiana, where it has been discovered in many coastal river systems, and in Amapá in Brazil.
Hyphessobrycon borealis has a tail very similar to the Buenos Aires tetra, with its black patch jutting out into yellow and then turning clear. A long black line runs down its body with an iridescent black below it and an iridescent gray above it.