- Scientific name: Aphyocharax anisitsi
- Common name: Bloodfin tetra
- Synonyms: Aphyocharax rubropinnis, Tetragonopterus rubropictus
- Group: Characins
- Habitat: South America, Argentina
- Size: 4-5 cm
- Biotope: Inhabit in the Rio Parana, in the upper and middle layers of the water
- Social behavior: A peaceful, schooling fish recommended for any community tank.
- Diet: Omnivorous; small flying insects, shrimp, Tubifex, insect larvae; flake.
- Breeding: Quite easy
- Tank: Minimum 80 litres
- Population: 8-10 fish for 100 litres
- Decoration: Dense vegetation, plant vallisneria and sagittaria along the edge and back of the tank. Use a dark tank bottom.
- Temperature: 22-26°C
- pH: 5,9-7,2
- Hardness: 8-12 NK°
- Lifespan: 3-5 years
Description: The base color of the bloodfin tetra is silver. Its belly is white while the fins are blood red. The outer parts of these fins are transparent. The species is most interesting, when kept in school. Very hardy, the bloodfin can live for a decade or more. Aphyocharax rubripinnis can be kept in an unheated aquarium, though its coloring will pale.
A small hook can be seen on the anal fin of the male, while females are larger and less colorful during spawning season. Spawns freely on the surface and indiscriminately between plants, laying 300 to 500 eggs. The eggs will be quickly eaten unless the adults are removed. The eggs hatch in 20-25 hours. Raise the fry with fine flake and brine shrimp.