Ctenochromis horei

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Introduction

The Ctenochromis horei, also known as Lukuga River, is a small African cichlid associated with the outlet of Lake Tanganyika in the Democratic Republic of the Congo. Its highly localized range and limited presence in the aquarium trade make it a fish best suited to aquarists who can maintain warm, alkaline and well-oxygenated water. This discreet species has a slender body, subdued natural coloration and territorial behaviour typical of many cichlids. With a rarity value of 3, very rare, it deserves careful attention, both for aquarium welfare and for the preservation of its wild populations.

General description

Ctenochromis horei is a small cichlid adapted to shoreline areas and flowing water in the Lukuga. It has an elongated, laterally compressed body, a proportionate head and well-developed fins. Its natural coloration is generally subdued, helping it blend with rocky substrates and shaded areas. Like many African cichlids, it establishes a social hierarchy and may defend a territory, especially while breeding. This is a very rare aquarium species that is better suited to a regional setup or a Tanganyikan cichlid aquarium than to a conventional community tank.

Geographic origin and biotope

Country of reference: Democratic Republic of the Congo. The species is associated with the Lukuga River, the western outlet of Lake Tanganyika, near its beginning at Kalemie. This area forms a transition between a lake environment and a more dynamic river system. The water is warm, mineral-rich, alkaline and well oxygenated. The habitat includes rocky shores, boulders, gravel and areas where current creates shelter between stones. In the aquarium, provide stable, hard and alkaline water, efficient filtration and adequate circulation without turning the entire aquarium into a torrent.

Precise location and local name

The locality associated with Ctenochromis horei is the Lukuga River, west of Lake Tanganyika in the Kalemie region. The English common name Lukuga River directly uses the name of the source waterway. No widely established regional vernacular name is commonly used in international aquarium literature. This locality name is nevertheless important because it distinguishes this form from other African cichlids and emphasizes its extremely restricted distribution. In the trade, the name Lukuga River should be retained carefully to prevent confusion with species or populations from other drainage systems.

Appearance and physical characteristics

Ctenochromis horei has an elongated body, a regular dorsal profile and a terminal mouth suited to picking food from surfaces and crevices. The coloration is usually brownish grey to olive, with vertical markings or a darker lateral line depending on mood, age and social context. The fins may become more contrasting in dominant males or during breeding. Its appearance is more natural than brightly coloured, which is part of its appeal. Its maximum adult size is around 12 cm, with possible variation depending on rearing conditions.

General diet

In its natural environment, Ctenochromis horei searches for small invertebrates, aquatic larvae, tiny crustaceans and organic particles found on the bottom. In an aquarium, offer a varied diet consisting of quality cichlid pellets, frozen foods and small prey appropriate for its size. Meals should remain moderate to prevent obesity and water-quality problems. A supplementary vegetable component may be offered, but the diet should mainly emphasize small invertebrates and protein-rich foods. Variety is preferable to excessive feeding with live food.

Essential data

• Name of the original river: Lukuga River
• Local name used: Lukuga River
• Origin of the scientific name: Ctenochromis refers to a Greek combination suggesting a comb-like structure and the genus Chromis; horei is a specific epithet formed as a proper name.
• Etymology of the full name: Ctenochromis: from the Greek ktenos, comb, and chromis, a traditional name applied to certain fishes; horei: a Latinized proper name.
• Common/vernacular names: Lukuga River, Lukuga River cichlid
• Family: Cichlidae
• Subfamily: Pseudocrenilabrinae
• Name pronunciation: ten-oh-KROH-miss HOR-ee-eye
• Discovery: Max Poll, 1948
• Maximum adult size: About 12 cm
• Water temperature and pH: 24 to 28 °C; generally alkaline, approximately pH 7.8 to 9.0
• Appearance of the watercourse and surrounding vegetation: A rocky, mineral-rich transitional watercourse with current, gravel, boulders and riparian vegetation.
• Typical tankmates: Littoral Lake Tanganyika cichlids, small rheophilic cichlids, juvenile local catfish and other fish using rocky areas.
• Temperament and behaviour: Territorial and generally reserved, with increased aggression between males and during breeding.
• Water depth: Shallow areas near shores and rocky sections.
• Sexual dimorphism: Adult males may be larger, more colourful and more assertive; differences can remain difficult to see in juveniles.
• Bottom structure and flow: Gravel, stones and boulders; moderate to strong current with sheltered spaces between rocks.
• Rarity: Very rare; rarity value 3.
• Availability: Exclusive at Ton.Fish in Canada.

In your aquarium

Success with Ctenochromis horei depends on warm, alkaline and well-oxygenated water, along with stable parameters. Provide a layout of rocks and gravel that creates visual boundaries and several shelters. Since this species is very rare, avoid impulse purchases, uncertain identifications and overly aggressive tankmates. A varied diet, strong filtration and regular water changes will help maintain its condition and natural behaviour.