This group of
freshwater fish is one of the largest and most diverse, containing over 1300 species. Most are found in
the Americas, with the rest mainly in
Africa. They are noted for having
teeth, having an
adipose fin, and being egg-scatterers. Most Characins are
omnivorous, although some are
herbivorous and
carnivorous.
Tetras, the popular aquarium fish, are a member of this group, as are Piranhas. Other members include hatchetfish and pencilfish.