Chilatherina alleni

A Little More Information...

Chilatherina alleni, also known as Wapoga Rainbow Red, is a rainbowfish from Indonesian Papua. This uncommon aquarium species is best recognized by the reddish coloration of mature males and its active schooling behavior. It thrives in clean, well-oxygenated, slightly alkaline water with moderate current. Like many rainbowfish, it should be kept in a group and provided with a spacious aquarium where its colors can develop fully. Its restricted origin in the Wapoga basin makes it an interesting choice for specialized aquarists who value geographic populations and less frequently seen rainbowfish.

General species description

Chilatherina alleni is a rainbowfish in the family Melanotaeniidae, adapted to flowing freshwater habitats in New Guinea. It has a relatively slender body and becomes most impressive when maintained in a group, with males displaying their fins and colors to one another. Its temperament is generally peaceful and sociable, although it is an active fish that remains in motion. It is suitable for a community aquarium with calm fish of comparable size. Its availability is uncommon, making it especially appealing to aquarists interested in geographic forms and less familiar rainbowfish.

Geographic origin and biotope

This species comes from Indonesian Papua, in the Wapoga River basin in the northern part of New Guinea. It inhabits freshwater streams with current, good oxygenation and often clear visibility. The habitat includes gravel, sand and rocky areas bordered by dense tropical vegetation that provides shade and shelter. In the aquarium, efficient filtration, good surface movement and regular water changes reproduce these conditions more effectively than stagnant water or excessive organic buildup.

Precise location and local name

The locality associated with Chilatherina alleni is the Wapoga River basin in Indonesian Papua. The most widely used aquarium vernacular name is Wapoga Rainbow Red, referring to both its geographic origin and the red coloration of the males. This trade name is more commonly used than any precisely attributed traditional local name. To preserve its geographic identity, it is best to keep this population separate from other Chilatherina forms and avoid mixing them during breeding.

Appearance and physical characteristics

Chilatherina alleni has an elongated, laterally compressed body covered with small scales. As in other Melanotaeniidae, the two dorsal fins are clearly separated and the caudal fin is forked. Mature males generally develop stronger colors, with red to orange tones on the rear body and fins, contrasting with cooler shades toward the front of the body. Females are usually less colorful and more uniform. Color intensity depends on age, sex, social hierarchy, water quality and diet.

General diet

Chilatherina alleni is omnivorous and readily accepts a varied aquarium diet. The staple diet can consist of quality flakes or small pellets, supplemented with frozen or live foods such as brine shrimp, daphnia and mosquito larvae. A rich, varied diet supports the red coloration of males, growth and overall condition. Portions should remain small enough to be eaten quickly. Feeding adults several times a day is preferable to offering one large meal, while uneaten food should be removed to prevent water quality problems.

Essential data

• River of origin: Wapoga River
• Local name used: Wapoga Rainbow Red
• Origin of the scientific name: Chilatherina is the genus name; alleni honors Gerald R. Allen.
• Etymology of the full name: Chilatherina combines Greek roots associated with the lip and atherine-like fishes; alleni honors Gerald R. Allen.
• Common/vernacular names: Wapoga Rainbow Red; Wapoga rainbowfish
• Family: Melanotaeniidae
• Subfamily: Melanotaeniinae
• Name pronunciation: kee-lath-er-EE-na - ALL-en-eye
• Discovery: Gerald R. Allen, 1999
• Maximum adult size: About 12 cm
• Water temperature and pH: 24 to 28 °C; pH 7.0 to 8.0
• Stream appearance and surrounding vegetation: Clear, flowing, well-oxygenated freshwater with stones, gravel and tropical streamside vegetation.
• Typical tankmates: Peaceful small rainbowfish; freshwater gobies; small open-water fish; freshwater snails; robust adult shrimp.
• Temperament and behavior: Peaceful, active and schooling; males display to one another.
• Water depth: Shallow to moderately deep sections of streams.
• Sexual dimorphism: Males are larger and much more colorful; females are generally duller with a rounder body.
• Bottom structure and flow: Sand, gravel and rocky bottom; moderate to strong current.

In your aquarium

To keep Chilatherina alleni successfully, provide a long, well-filtered, covered aquarium and maintain a group with more females than males whenever possible. Stable, clean and well-oxygenated water is essential, as is open swimming space with some plants around the edges. A varied diet and several small daily feedings support growth and coloration. Since this is an uncommon fish associated with a distinct geographic population, avoid crossing it with other Chilatherina forms in order to preserve the Wapoga lineage.