Lake Kutubu rainbowfish (Melanotaenia lacustris)
The Lake Kutubu rainbowfish (Melanotaenia lacustris) is a species of fish in the family Melanotaeniidae. It is also known as turquoise rainbowfish. It is one of 13 fish endemic to Lake Kutubu, a lake found within the Kikori River system in Papua New Guinea.
In Aquariums and Zoos: relative common in european aquariums