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The Poropanchax luxophthalmus, also known as the Emerald Green Lampeye, is a small African fish valued for its luminous eyes and emerald-green coloration. Its discreet body becomes much more impressive when it moves as a group through a well-planted aquarium. This peaceful species is suitable for calm community setups containing small, non-aggressive fish. It prefers stable, clean water ranging from slightly acidic to neutral, with gentle filtration and shaded areas. Availability is somewhat irregular, making it a sought-after choice for aquarists who want a small active shoal with metallic reflections in a natural-looking aquascape.

General species description

Poropanchax luxophthalmus is a small African cyprinodontoid from the family Aplocheilidae. It stays close to the surface and shows strongly social behavior; keeping several individuals allows more natural interactions and reduces nervousness. Males display to one another, while females are usually less intensely colored. In an aquarium, the species is peaceful, but its small size requires calm tank mates of comparable size. Surface vegetation helps secure the shoal, which may otherwise remain shy after introduction. Its rarity level is intermediate: it is less common than many small African fish, which increases its appeal among specialized aquarists. Ton.Fish offers it as an obvious exclusive in Canada, making it an interesting opportunity for Canadian hobbyists looking for a less common lampeye.

Geographic origin and biotope

Reference countries: Nigeria and Cameroon. The species is associated with the Cross River basin and coastal waterways in the region. Its natural environment consists of small rivers, streams, and quiet areas where light is filtered by vegetation along the banks. The water is generally soft to moderately mineralized, with low to moderate flow and a bottom made of sand, mud, and plant debris. Submerged plants, roots, and leaf litter provide shelter while also creating feeding areas for small prey. To reproduce this setting, use a densely planted aquarium, partially shaded surface areas, and filtration that does not create excessive turbulence. The quiet waters of the Cross River basin and its abundant vegetation are the main references for aquarium design.

Precise location and local name

The known range includes southern Nigeria and Cameroon, particularly within the Cross River drainage system. The most commonly used trade or vernacular name is Emerald Green Lampeye. The term lampeye refers to the strongly reflective eye, especially visible under side lighting or when the fish stays near the surface. Like several small African fishes, it may be sold under varying commercial names, so identification by the scientific name remains important. In aquarium stores and among hobbyists, Emerald Green Lampeye remains the most practical and distinctive name for this fish with its bright eyes and greenish body.

Appearance and physical characteristics

The body of Poropanchax luxophthalmus is elongated, slender, and slightly compressed from side to side. Overall coloration ranges from olive brown to metallic green, with stronger reflections when the fish is healthy and kept over a dark substrate. The eyes show a characteristic luminous reflection, while the fins are generally translucent with yellowish or greenish tones. Adult males are more colorful and often have more developed fins; females are usually deeper-bodied, with less intense coloration. Adult size remains small, at about 3.5 to 4 cm. Soft lighting, plants, and a dark background bring out its emerald reflections without causing unnecessary stress. Avoid fish large enough to treat it as prey.

General diet

In nature, Poropanchax luxophthalmus searches for small prey at the surface and among vegetation, including microcrustaceans, insect larvae, and other tiny organisms. In aquariums, it accepts a varied diet of small frozen or live foods such as baby brine shrimp, daphnia, and mosquito larvae, along with very small dry foods. Pellets or flakes must be fine enough to swallow easily. It feeds mostly in the upper levels, although slowly sinking particles may also be eaten. Several small feedings are preferable to one large meal. A varied diet supports stronger coloration and good condition in breeding fish. Small prey items and a rich, varied diet are central to successful care.

Essential data

• River of origin: Cross River
• Local name used: Emerald Green Lampeye
• Origin of the scientific name: The specific name luxophthalmus refers to the luminous eye; Poropanchax is the genus name used for African lampeye fishes.
• Etymology of the full name: lux means light and ophthalmus means eye; Poropanchax is the genus name.
• Common/vernacular names: Emerald Green Lampeye; green emerald lampeye
• Family: Aplocheilidae
• Subfamily: Aplocheilinae
• Name pronunciation: por-oh-PAN-kaks loo-ks-off-THAL-muss
• Discovery: Brüning, 1929
• Maximum adult size: About 4 cm
• Water temperature and pH: 22 to 26 °C; pH 6.0 to 7.5
• Watercourse appearance and surrounding vegetation: Small quiet or moderately flowing waterways bordered by dense vegetation, roots, and leaf litter.
• Typical tank mates: Aphyosemion australe, Epiplatys annulatus, Aplocheilichthys normani, small African tetras, peaceful small rasboras
• Temperament and behavior: Peaceful, social, and active near the surface; males display to one another.
• Water depth: Shallow areas near the surface and vegetation.
• Sexual dimorphism: Males are more colorful and often more slender, with more developed fins; females are deeper-bodied.
• Bottom structure and flow: Sand, mud, and plant debris; low to moderate current.

For greater success

To keep Poropanchax luxophthalmus successfully, use a mature, well-covered, densely planted aquarium with moderate lighting and gentle filtration. Keep it in a group and select peaceful companions that cannot swallow it. Stable water, regular water changes, and fine, varied foods support natural coloration and behavior. Shaded areas near the surface are especially useful. Since the species has intermediate availability and is offered exclusively in Canada by Ton.Fish, careful acclimation is worthwhile. A combination of moderate flow, a planted aquarium, and a sufficiently large group will provide the best results.