relatively peaceful but will eat smaller fish when
larger. Provide floating plants for seclusion as this
is a nocturnal species. Provide caves/pipes for hiding
out during the daylight hours. Sexual Differences:
as with all of this family internal fertilization
is carried out. The anal fin is the key to the sexual
dimorphism of this genus, if you think of the male
and female of most livebearer fish (Goodeidae
family) and you will not be too far away with this
assumption. The female has a normal anal fin but the
males are modified into a copulatory organ with the
first and second ray thickened and longer, it is thought
that the male uses this to clasp the female during
the spawning embrace. The eggs are laid on a
previously cleaned surface.
South America:Upper Amazon River basin. Type locality:Rio Guaporé, Brazil.
Baensch, H.A. and R.
Riehl 1985 Aquarien
atlas. Band 2. Mergus, Verlag für Natur- und
Heimtierkunde GmbH, Melle, Germany. 1216 p.