The dawn tetra, panda tetra, or [Rio] Paraguay tetra (Aphyocharax nattereri) comes from the Rio Paraguay basin in Paraguay and Brazil.

It is a schooling fish. Suitable temperatures for the Paraguay tetra are . This species is omnivorous with a strong preference for animal food. It will eat normal aquarium fish food, but much prefers live food. The dawn tetra is an egg-scattering species. This tetra is very active and extremely aggressive towards fish of similar or smaller size or those that are slower moving. They are not suitable for a community tank.

Dawn tetras are a small fish species, typically reaching a size of . They are also sometimes referred to as "dwarf" tetras due to their small size.