Maculipinnis Killifish

Rachovia maculipinnis is a spectacular annual killifish from temporary pools and flooded savannahs in Venezuela and Colombia, where seasonal drought forces the species to complete its entire life cycle within a single rainy season. Males display vivid blue-green body colouration with extensive red spotting on the fins and body, and mature individuals develop elaborate fin extensions that are displayed during courtship. The species is among the most colourful South American annual killifish.

R. maculipinnis requires a dedicated 60 L species tank with a deep peat substrate for egg deposition. Very soft, acidic water reflecting the chemistry of South American blackwater habitats is essential. Eggs undergo a mandatory diapause of 10–16 weeks in moist peat before re-wetting triggers hatching. Males are highly territorial and must be kept one per tank.

Rachovia maculipinnis is a highlight of the South American annual killifish fauna and is maintained almost exclusively through dedicated hobbyist breeding networks. Its spectacular colouration and fascinating annual life history make it one of the most sought-after killifish in the specialist hobby.

Water: 22–28 °C, pH 5.5–7.0, very soft acidic water (GH 1–5) — RO or rain water recommended. Tank: 60 L species tank; deep peat substrate (6–8 cm) for natural egg burial. Feeding: Live and frozen Artemia, Daphnia, bloodworm; feed twice daily for best condition. Breeding: Harvest peat every 4–5 weeks; dry storage 10–16 weeks; re-wet slowly to trigger hatching. Compatibility: Species tank only — males will fight to the death if housed together.