Overview
The Boeseman's Rainbowfish (Melanotaenia boesemani) is a freshwater fish belonging to the family Melanotaeniidae. It thrives at temperatures of 25–30 °C with a pH of 7.0–8.0, and requires a minimum tank volume of 110 litres. Known for its peaceful, active community fish; males display to each other spectacularly, it is considered a beginner-level species. Best colours develop with multiple males present; a mixed-sex group of 8+ is ideal. Water changes of 25–30 % weekly, stable parameters, and appropriate tank mates are key to long-term success with this species.
Scientific Classification
| Rank | Classification |
|---|---|
| Family | Melanotaeniidae |
| Genus | Melanotaenia |
| Species | Melanotaenia boesemani |
| Water type | freshwater |
| Native range | Australasian |
Natural Habitat
Melanotaenia boesemani originates from Australasian. It inhabits freshwater environments and is adapted to the water conditions found in its native range.
Appearance
Adults reach 8–10 cm in length. The body is freshwater and the species displays characteristic coloration suited to its environment.
Behavior
This species is described as a peaceful, active community fish; males display to each other spectacularly. It naturally schools and should be kept in groups of 6 or more. Activity level is high. Best colours develop with multiple males present; a mixed-sex group of 8+ is ideal.
| Trait | Value |
|---|---|
| Temperament | peaceful, active community fish; males display to each other spectacularly |
| Schooling | Yes |
| Activity level | high |
Water Requirements
| Parameter | Ideal Range | Notes |
|---|---|---|
| Temperature | 25–30°C (77–86°F) | Use a reliable adjustable heater |
| pH | 7–8 | Avoid sudden swings |
| Hardness (GH) | 9–19 dGH dGH | Soft to moderately hard |
| Ammonia | 0 ppm | Any detectable ammonia signals a problem |
| Nitrite | 0 ppm | Toxic even at low levels |
| Nitrate | <20 ppm | Manage through regular partial water changes |
| Min. tank | 110L (29 gal) | Larger tanks are easier to keep stable |
Interesting Facts
- ENDANGERED in the wild — endemic only to Lake Ayamaru and nearby lakes in West Papua, Indonesia.
- The blue-and-orange bicolour pattern is one of the most striking of any freshwater fish.
- Captive-bred fish are the primary source for the trade; collecting wild fish should be avoided.
📋 Full Care Guide
Ready to set up a tank for your Boeseman's Rainbowfish? The complete care guide covers tank setup, feeding schedule, common diseases, tank mates, and breeding.
Read Boeseman's Rainbowfish Care Guide →Related Species
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This species profile was reviewed for biological accuracy and practical aquarium care guidance. For suspected illness or disease, test your water parameters first and consult an aquatic veterinarian if symptoms persist.