Madagascar Panchax

This is a fairly large killifish: adults in the aquarium reach up to 9 cm. Males are larger than females and display a striking reddish body colour dotted with light speckles, with a violet-tinged back. Females look duller, with a silvery body and barely visible speckles.

This species occurs naturally in a few river systems in the north of Madagascar, near Antsiranana. It inhabits both swift mountain streams and lowland rivers flowing through tropical forest, where aquatic plants are sparse. Today it is almost impossible to find in the wild. Habitat loss due to logging, reduced river flow, and water pollution have devastated the species. It also faces severe competition from invasive fish introduced by humans, such as gambusia.

The Madagascar Panchax is relatively peaceful and can live with most other fish of similar temperament, but smaller species may be chased or attacked. Within the species, a dominant alpha male establishes hierarchy. Several males will fight, though injuries are usually minor. The best arrangement is one male with two or three females.

A group of several adults needs a tank of at least 80 litres; bigger is better. Decor can be simple: a few large-leaved plants, including floating ones. Use sand or stones with large boulders scattered across the bottom. Provide a heater, light, and an air pump. Pay special attention to filtration. Get the most powerful filter you can afford for your tank size, because the Madagascar Panchax needs crystal-clear water and tolerates no pollution. If that is not possible, increase weekly water changes from 15–20% to 30%. The replacement water must match the tank water in temperature and chemistry (pH and dGH).

The Madagascar Panchax is not fussy about food and readily eats any high-protein dry food. Supplement daily with protein foods such as mosquito larvae, small flies, worms, bloodworm, or daphnia, offered live or frozen. Feed 2–3 times a day, giving only what is eaten in 5 minutes; remove any uneaten food at once.

The fish spawn throughout the year. Spawning can occur in the main tank if only this species is kept. Provide safe refuges for fry, such as dense patches of fine-leaved plants like Java moss or Riccia. The female lays eggs among the plants, and fry appear in due course. They remain in these shelters until large enough to swim with adults. Parents usually do not eat their young if fed adequate protein.

In a well-established tank with stable water conditions, health problems are uncommon. No species-specific diseases have been reported.

When buying, choose active, vigorous fish with clean fins and no visible damage or sores. Avoid sluggish individuals with clamped fins, or those showing odd behaviour such as hiding constantly on the bottom or in a corner. Given the species' endangered status, buy only from reputable breeders who can confirm tank-bred origin, as all aquarium stock derives from a limited number of founders.