Blue rainbowfish
Encyclopedia
Melanotaenia caerulea is a species of fish
Fish
Fish are a paraphyletic group of organisms that consist of all gill-bearing aquatic vertebrate animals that lack limbs with digits. Included in this definition are the living hagfish, lampreys, and cartilaginous and bony fish, as well as various extinct related groups...

 in the Melanotaeniidae family. It is endemic to Papua New-Guinea. It is found mostly in the lower and middle Kikori
Kikori
Kikori is a settlement in Papua New Guinea.Kikori lies in the delta of the Kikori River at the head of the Gulf of Papua. This area is particularly biologically rich with a diversity of ecosystems and densely forested, with an intricate system of rivers. The geography is that of limestone karst...

drainage system
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