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Melanotaenia sp. Kali Jamas, also called Kali Jamas Rainbow, is a very rare Indonesian rainbowfish still referred to by a provisional designation. Its name directly recalls Kali Jamas, the watercourse associated with the known population. Like several members of the genus Melanotaenia, it is a schooling, active fish that is especially appealing in a well-planned regional or community aquarium. Its coloration can become stronger with stable water, a varied diet, and the presence of other members of its group. It is best suited to aquarists who appreciate uncommon geographic forms and want to preserve their local identity.

General species description

Melanotaenia sp. Kali Jamas is an undescribed geographic form of the genus Melanotaenia, in the family Melanotaeniidae. Like other rainbowfish, it has a laterally compressed body, a divided dorsal fin, and energetic midwater swimming habits. Its main appeal is its status as a localized Kali Jamas form and its rarity in the aquarium trade. It should be kept in a group, since social interaction supports natural behavior and stronger coloration. A spacious, well-oxygenated aquarium with regular maintenance is more suitable than a small, overcrowded setup.

Geographic origin and biotope

This population comes from Indonesia, in the eastern part of the archipelago where rainbowfish diversity is especially high. The type of habitat associated with this fish generally consists of warm freshwater, regular water movement, light filtered by vegetation, and shelter created by branches or marginal plants. In the aquarium, clean, stable, well-oxygenated water is the priority. Peripheral planting combined with an open swimming area creates a functional environment without filling the entire aquarium with décor.

Precise location and local name

The known geographic name is Kali Jamas, a watercourse in Indonesia associated with this rainbowfish form. The Indonesian term “kali” generally means river or watercourse. The local name used in the aquarium trade is Kali Jamas Rainbow. This designation separates the population from related forms of Melanotaenia and preserves its origin information. For such a rare form, keeping the locality name is important, and mixing it with other geographic populations should be avoided.

Appearance and physical characteristics

Melanotaenia sp. Kali Jamas has the typical rainbowfish profile: a relatively deep, laterally compressed body, small reflective scales, a terminal mouth, and two separate dorsal fins. Adult males are usually more intensely colored, especially during courtship or when displaying to females. The exact coloration of this form may vary with age, lighting, diet, and lineage. Its key traits are its iridescent coloration, streamlined profile, and constant activity in open water. Mature males are generally deeper-bodied and more brightly colored than females.

General diet

Melanotaenia sp. Kali Jamas is an opportunistic omnivore that generally accepts quality dry foods, frozen foods, and small prey suited to its size. A varied diet supports good condition and stronger coloration. Micro-pellets, flakes, brine shrimp, daphnia, and other protein-rich foods can be rotated, with a plant component included as well. Meals should be small and eaten quickly to protect water quality. Juveniles benefit from more frequent feedings, while adults can receive two small meals per day.

Essential data

• Name of the source river: Kali Jamas
• Local name used: Kali Jamas Rainbow
• Origin of the scientific name: Melanotaenia sp. identifies a population in the genus Melanotaenia whose species name is not provided.
• Full-name etymology: Melanotaenia comes from Greek terms associated with black and band; sp. means undetermined species; Kali Jamas is the locality name.
• Common/vernacular names: Kali Jamas Rainbow; Kali Jamas rainbowfish
• Family: Melanotaeniidae
• Subfamily: Melanotaeniinae
• Name pronunciation: mel-an-oh-TAY-nee-ah - sp. - KAH-lee JAH-mas
• Discovery: The discoverer and year are not provided.
• Maximum adult size: Provide an aquarium large enough for full growth rather than relying on a single figure.
• Water temperature and pH: 24 to 28 °C; pH 6.5 to 8.0 in aquaria
• Watercourse appearance and surrounding vegetation: Warm freshwater, well oxygenated, with marginal vegetation and woody debris.
• Typical tankmates: Peaceful rainbowfish, small open-water fish, and calm species of comparable size.
• Temperament and behaviour: Peaceful, schooling, active, and best kept in a group.
• Water depth: An open swimming area is more important than a deep aquarium.
• Sexual dimorphism: Males are usually brighter and more robust; females are generally subtler.
• Bottom layout and flow: Non-abrasive substrate, open swimming space, and regular water circulation.

In your aquarium

Success with Melanotaenia sp. Kali Jamas depends on keeping a properly sized group, providing a long aquarium, and maintaining effective filtration. Keep the water stable, perform regular water changes, and offer a varied diet. Because this form is very rare, avoid crossing it with other Melanotaenia populations and preserve its locality identity carefully. Plants along the sides, open swimming space, and peaceful tankmates will reduce stress and help display its colors.