Wanam Glossolepis

Glossolepis wanamensis shares its critically endangered status and its tiny range in Lake Wanam, Papua New Guinea, with the better-known Melanotaenia wanamensis. This lake, threatened by introduced species and catchment pressures, may be the only location in the world where this Glossolepis is found. Males develop a reddish-bronze to copper-coloured body with a pronounced dorsal hump — a feature amplified by the body shape typical of large, dominant male Glossolepis — and vivid orange-red fins.

Keepers of G. wanamensis bear a particular responsibility, as captive populations represent an important safety net for the species. Aquarists maintaining this fish are strongly encouraged to connect with conservation organisations, maintain breeding records, and distribute surplus fish to other responsible keepers rather than allowing specimens to enter anonymous trade channels.

Care requirements mirror those of other large Glossolepis — warm, alkaline, hard water; a large, well-filtered aquarium; and a varied diet to maintain peak condition and colouration. The species breeds in typical rainbowfish fashion and is not particularly difficult to spawn once established.

Water: Hard, warm, alkaline water critical; pH 7.5–8.5, temperature 25–30°C, GH 12–20. Tank: Minimum 250 L; open swimming space; strong filtration; stable water chemistry. Feeding: Quality large pellets and flake; generous live and frozen foods for colour and breeding condition. Breeding: Egg scatterer; maintain breeding records; distribute offspring to verified responsible keepers. Compatibility: Peaceful; best as species group or with other large, non-aggressive fish from the same biotope.