Kamaka Rainbow
Kamaka Rainbow (Melanotaenia kamaka) is a striking and unusual rainbowfish from Papua New Guinea with a distinctly different silhouette from most Melanotaenia. Adult males develop a notably deep, disc-like, almost circular body profile with a steep forehead — giving them an impressive, almost discus-like shape. The steel-blue to navy body color with dark scale edging creates a rich, textured appearance.
Feeding & Care Tip: Sera Vipan Tropical Flakes and Hikari Micro Pellets make excellent daily staples. Supplement 2–3× per week with Hikari Frozen or Freeze-Dried Bloodworms. Crush flakes for juveniles; soak pellets.
Native to the Kamaka River and surrounding drainages in Papua New Guinea. This species was only described in 1996 and is still not commonly available in the hobby. Inhabits clear, moderately flowing streams.
Keep in groups of at least six with mixed sexes. Males develop the distinctive deep body profile fully only at maturity — juveniles look more typical for the genus. Completely peaceful with other medium to large community fish.
A well-planted aquarium with open swimming space in the center replicates the rainbowfish's natural riverine habitat. These are active, fast-swimming fish that appreciate length more than height — a longer tank allows them to build up speed and display properly. Good filtration and regular partial water changes are important, as rainbowfish are sensitive to deteriorating water quality. Avoid very small or slow-moving tankmates that may be outcompeted at feeding time.
Care & Ideal Parameters
| Difficulty | Easy |
| Temperament | Peaceful — Community |
| Typical Adult Size | 4.5 inches (11 cm) |
| Min. Group Size | 6 minimum — mixed sexes; males develop disc-like profile at maturity |
| Ideal Temp | 72–82°F (22–28°C) |
| Ideal pH | 7.0–8.0 |
| Ideal GH | 8–20 dGH |
| Ideal KH | 4–12 dKH |
| Staple Food | Sera Vipan Tropical Flakes; Hikari Micro Pellets |
| Treat / Supplement | Hikari Frozen or Freeze-Dried Bloodworms |
| Origin | Kamaka River drainage, Papua New Guinea |
| Notes | Described in 1996. Males develop distinctive deep, almost circular body profile at maturity. Steel-blue to navy coloration. Uncommonly available. Clear water preferred. |
