|Synonyms||Acanthophacelus melanzonus, Micropoecilia amazonica, M. melanzona, M. parae, Poecilia amazonica, P. melanzona|
|Distribution||South America: Brazil, French Guiana, Guyana, and Suriname.|
|Sexual Dimorphism||Males have a gonopodium and more colourful finnage; females are a muted light grey with a tiny dark shoulder spot, and grow much larger than the males.|
|Maximum Size||Females up to 5cm (2”), males up to 3cm (1.2”).|
|Water Parameters||Best maintained in slightly brackish conditions. pH: 7-8, dH: 8-20 degrees. SG: 1.002 to 1.005.|
|Temperature||24-28 deg C (75-82 deg F)|
|Compatibility||Species aquarium or brackish community of small peaceful fish only.|
|Lighting||No special requirements|
Some interesting studies have been carried out on the breeding of different colour morphs of these fish. The females are promiscuous and will mate with several males during a short period. In an aquarium with several different colour morphs, females tend to prefer mating with a red or yellow Melanzona male over the other varieties. If these are not present, the females then tend to favour the blue Melanzona over the Parae variant. And last of all, the lacklustre Immaculata is the least likely to be invited to mate with the female, and for this reason it has developed a stealth tactic in order to mate. The Immaculata male, which has similar colouration to the female and so is quite inconspicuous, waits until the female is being displayed to by a red or yellow Melanzona male, sneaks up next to the female whilst her attention is temporarily occupied and quickly mates with her, without her consent.
In an aquarium with adults continually present, it is more likely that blue Melanzona, Parae, and Immaculata fry will reach adulthood, as the red and yellow Melanzona fry are more easily seen and consequently preyed upon.