Rachovi Killifish Identification Guide
A guide to recognizing this iconic East African annual killifish by its bold red-and-blue barred pattern.
Read the full Rachovi Killifish encyclopedia entry →
Key identification features
- Compact, stocky body reaching about 6 cm, robust compared to many slimmer killifish relatives
- Males display striking turquoise-blue flanks crossed by broad, distinct red-orange vertical bars
- Caudal fin is large and rounded, often edged in black with a red or orange base
- Dorsal and anal fins repeat the blue-and-red banding seen on the body
- Flattened head profile with an upturned mouth typical of surface-feeding annual killifish
- Females are plain grey-brown with little to no barring, useful for confirming sex at a glance
Common look-alikes
- Redtail Notho: shows fine red spangling over a blue body rather than bold, well-defined red bars
- Steel-blue Killifish: stays a cool metallic blue-grey overall without the strong red banding
- Palon killifish: smaller and more subdued in coloration, lacking the vivid contrasting bars
Where you'll see one
Native to seasonal floodplain pools and swamp margins in coastal Mozambique in southeastern Africa. Like other Nothobranchius species it lives fast, maturing within weeks and laying drought-resistant eggs in the mud before the temporary pools dry up each year, with the population re-emerging from those eggs when rains return.
Frequently asked questions
What is the clearest way to identify Rachovi Killifish?
Look for bold, well-defined red-orange vertical bars crossing a turquoise-blue body, bolder and more contrasting than related Nothobranchius species.
How does it differ from Redtail Notho?
Rachovi Killifish shows distinct broad red bars, while Redtail Notho has finer red spangling and a solid orange-red tail instead of banding.