Lorentz's Rainbowfish

Chilatherina lorentzii is a large and elegantly built rainbowfish from the upper Digul River drainage of West Papua, Indonesia. It is one of the rarer members of the Chilatherina genus in the hobby and is prized for its elongated, streamlined body — somewhat more slender than C. bleheri — and superb iridescent patterning. Dominant males develop a rich blue-green body with gold and copper highlights on the scale edges and vivid orange-red fins.

This species is adapted to the warm, moderately hard, slightly alkaline waters of its lowland river habitat and requires a spacious, well-filtered aquarium. Because of its comparative rarity, hobbyists maintaining this species are encouraged to document their stock's origin and engage with the broader rainbowfish community to support captive genetic diversity.

Chilatherina lorentzii breeds in standard rainbowfish fashion — scattering adhesive eggs among fine-leaved plants or spawning mops. Males require adequate space to display and must be kept with enough females to distribute spawning activity. It is generally peaceful with other large rainbowfish.

Water: pH 7.0–8.0, temperature 23–28°C, moderately hard; maintain excellent water quality with regular changes. Tank: Minimum 200 L; open midwater swimming space; dense planting at sides and rear for contrast and shelter. Feeding: High-quality flake and pellets; supplement with live brine shrimp, daphnia, and bloodworms regularly. Breeding: Egg scatterer on fine plants or mops; separate spawning setup recommended; document provenance carefully. Compatibility: Peaceful with other large rainbowfish; avoid small or timid species that may be outcompeted.