Aequidens rivulatus, Günther, 1859
Origin:Equador and Peru, in tributaries to the amazon river. On the web it's also reported from Colombia and Venezuela, but this could be Aequidens pulcher.
Etymology: rivulatus= from rivers?
Synonyms: Chromis rivulatus, Acara rivulata
First European import: Unk
Description: See pictures. In the picture you can see the juvenile coloration and bodyshape. Older animals have less vivid colors, and the cranium is more pronounced.
Care:A 80 cm or larger well planted tank, with sandy soil, and some driftwood and stones, since the fish require hideouts. Very aggressiv and bullying fish, hence the English name "Green terror", that disturb the soil. Not very particular to watervalues, can be kept in soft acidic water as well as in hard water at a higher pH.
Feeding:Live and frozen food, also meat and vegetables(peas).
Size:Up to 20 cm. Females 12 cm.
Breeding:Temperature should be raised a little to 26 degrees, and combined with a large waterchange this usually leads to spawning behaviour.The fish will spawn on a stone, preferably a flat stone, which is cleaned minutely prior to spawning. Up to 800 eggs are laid which will hatch after 4 days, and the fry will be freeswimming a week later. The female guards the eggs against all other fish, including the male.
Sexual dimorphism: Males are larger and have brighter colors
Additional: Old reports about Aequidens pulcher sometimes state that it can reach up to 20 cm, but this is due to mixups with Aequidens rivulatus. Aequidens rivulatus can live up to 10 years.
A movie is available about this fish at LINK
Picture references:Picture 1: E. Naus
References: Baensch and Riehl(1996): Aquarien atlas I. LINK.
If you have any comments please mail to aquaworld
All images, information, text, and other information/items in this site © Aquaworld website as described in the Berne convention.