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Distichodus lefini, also known as the Lefini River Green Dwarf, is a small African characiform associated with the Congo Basin. Its name directly refers to the Lefini River, where this dwarf form has been recorded. Smaller and more discreet than several larger Distichodus, it stands out through its slender body, greenish coloration and active behavior. This species remains relatively uncommon in the aquarium trade. The specimens offered here are wild collected, so careful acclimation and a proper quarantine are important. In an aquarium, provide clean water, good oxygenation, a structured layout with shelter and a varied diet with a strong vegetable component.

General species description

Distichodus lefini belongs to the Distichodontidae, a group of mainly freshwater African fishes. It is a small member of the genus Distichodus, quite different from the much larger species often sold under the same genus. Its appeal comes from its modest adult size, streamlined shape and predominantly green coloration. It is an active fish that is generally peaceful with similarly sized tank mates, but it should be kept in a mature, well-structured aquarium. Wild specimens can be sensitive to rapid changes in temperature, pH or conductivity after arrival. Slow acclimation, subdued lighting at first and several areas of plant cover help them settle. Its availability is intermediate: it is less common than the familiar Distichodus species, but not impossible to obtain.

Geographical origin and biotope

Country reference: Republic of the Congo. The species is associated with the Congo Basin, in the freshwater systems of Central Africa. Its habitat includes river sections and marginal areas where current strength can change with the season. The Lefini River flows through an environment of forest and wooded savanna, with water that may be stained by organic matter and plant debris. In this type of habitat, fish use submerged branches, roots, leaf litter and plants along the banks. For an aquarium, this suggests a layout with wood, hardy plants and open swimming areas. Efficient filtration, regular circulation and high oxygen levels are especially important for recently imported wild fish.

Precise location and local name

The locality associated with Distichodus lefini is the Lefini River, in the Congo Basin of the Republic of the Congo. The English trade name Lefini River Green Dwarf is the easiest name to use when identifying it in the aquarium hobby. No widely used regional vernacular name is included here. The word “dwarf” refers to its small size compared with several other Distichodus species, rather than to an aquarium-created dwarf form. This geographical origin gives useful guidance for aquarium design: soft water, abundant cover, filtered light and marginal vegetation. Since the fish offered are wild collected, their locality should be kept in maintenance records to avoid mixing them with other small Central African Distichodus.

Appearance and physical characteristics

Distichodus lefini has a streamlined, laterally compressed body, a relatively short head and a forked caudal fin. Its overall color ranges from olive green to greenish brown, with lighter flank reflections depending on lighting and condition. The fins may show yellowish or orange tones, especially in well-conditioned specimens. As in several Distichodus, the mouth and teeth are suited to grazing plant material and the small organisms living on surfaces. Wild fish may temporarily lose color after transport; subdued light and hiding places encourage recovery. Adult size remains modest, but the species needs a longer aquarium than its dwarf name might suggest because it is an active swimmer and regularly uses open water.

General diet

In the wild, Distichodus lefini mainly uses plant material available on submerged surfaces, along with small invertebrates and other opportunistic foods. In the aquarium, the diet should be based on vegetable-rich foods such as algae wafers, spirulina tablets, herbivore preparations and blanched vegetables including zucchini or spinach. A small portion of frozen foods, such as brine shrimp or mosquito larvae, can also be offered to broaden nutrition without turning the diet into a meat-based regime. Dietary variety helps maintain the condition of wild fish. Offer small, regular meals; leftovers decompose quickly in warm water. A diet that is too rich in protein or too low in fiber may promote excess weight and digestive problems.

Essential data

• Native river: Lefini River
• Local name used: Lefini River Green Dwarf
• Origin of the scientific name: Distichodus refers to teeth arranged in two series; lefini refers to the Lefini River.
• Full-name etymology: Distichodus comes from Greek words meaning two rows of teeth; lefini is a geographical name derived from the Lefini River.
• Common/vernacular names: Lefini River Green Dwarf
• Family: Distichodontidae
• Subfamily: Distichodontinae
• Name pronunciation: dis tee KOH dus - leh FEE nee
• Discovery: John Treadwell Nichols and Ludlow Griscom, 1915
• Maximum adult size: about 10 cm
• Water temperature and pH: 24 to 28 °C; pH 5.5 to 7.0
• Watercourse appearance and surrounding vegetation: African river habitat bordered by forest and wooded savanna, with branches, roots, leaf litter and riverbank vegetation.
• Typical tank mates: peaceful small African characiforms and bottom fish of similar size; avoid highly aggressive species or fish large enough to swallow them.
• Temperament and behavior: active, generally peaceful, exploratory and inclined to graze surfaces.
• Water depth: shallow to moderately deep sections of rivers and marginal habitats.
• Sexual dimorphism: limited; mature females may have a fuller body when carrying eggs.
• Bottom structure and flow: sandy or muddy substrate mixed with plant debris, with low to moderate current zones.

In your aquarium

Keeping Distichodus lefini successfully is easiest in a mature aquarium with stable, well-oxygenated water. Because these are wild-collected fish, quarantine and gradual acclimation are essential. A layout with wood, hardy plants and shaded areas better reflects its environment than a very bare tank. Provide enough tank length for active swimming, use a well-fitted cover and perform regular water changes. A varied vegetable-based diet, occasionally supplemented with frozen food, helps maintain condition. Choose peaceful tank mates of similar size that accept the same water parameters. With a rarity value of 2, it is an uncommon and interesting choice for aquarists seeking a distinctive African species without selecting one of the larger Distichodus.