Not furry, but we like them anyway.
Rachow's Nothobranch
Nothobranchius rachovii Ahl, 1926
Also called Bluefin notho, Bluefin nothobranch, Rainbow nothobranch
From South-east Africa: seasonal pools and swamps on the floodplains of the lower Pungwe and lower Zambezi rivers in Mozambique, near Beira.123
At a glance the quick version
Seriously Fish 5.5 cm SL; FishBase and Wikipedia 6 cm TL
Seriously Fish: 6-12 months in captivity; Wikipedia: up to about 1.5 years. A naturally short-lived annual fish
Looks how to spot one
Scaled, stocky annual killifish
A small killifish with strong differences between the sexes: males are vividly patterned in orange and blue, while females are more neutral in colour.13
Personality what they are like
Males are feisty with one another. It is best kept in a species tank, though some keepers house it with similar-sized peaceful fish such as pencilfish or kuhli loaches.13
Daily activity how busy a day looks
Grows and matures quickly and does well in a heavily planted tank.13
Grooming and care the hands-on bits
Soft, slightly acidic water suits it. Breeders store the eggs out of water for months, then add water to start hatching.12
Home where they are happiest
Minimum tank base about 45 x 30 cm (around 40 litres; Wikipedia suggests 40-60 litres). Temperature 20-24 °C, pH 6.0-7.5, hardness 3-10 dGH. Plenty of plants.123
Food basics what goes in the bowl
Small live or frozen foods such as daphnia, brine shrimp and chopped bloodworm.1
Company who they like around
Males are aggressive towards other males, so it is usually kept in pairs.13
The story where it all began
Ernst Ahl described it in 1926 from Beira, Mozambique. It is named after Arthur Rachow, a German aquarist who helped bring many fish to scientists in Berlin.23
Fun facts for the dinner table
- 1
In the wild its pools dry out each year; its eggs wait buried in the mud until the next rains bring water back.3
- 2
Eggs need about 5-7 months in damp storage before they are ready to hatch.1
- 3
Young fish mature remarkably fast: in about 3 weeks according to Seriously Fish, or about 12 weeks according to FishBase.4
- 4
The genus name Nothobranchius means 'false gill' in Greek.2
Recognised by the official bits
- IUCN Red List
- Least Concern (assessed January 2019)2
- Taxonomy
- Family Nothobranchiidae; described by Ernst Ahl in 1926 with Beira, Mozambique as type locality3
The care rhythm Furry Diary remembers it for you
A typical home-care rhythm for a Rachow's Nothobranch. It is our own starting plan, not a vet's advice, and you can change every line in the app.
- FeedingSmall amounts once or twice a dayevery day
- Temperature checkevery day
- Water changeAbout 25% of the waterevery week
- Water testevery week
- Glass cleanevery week
- Filter rinseRinse in old tank water, never tap waterevery month
You might also like
Clown Killifish
Blue Lyretail Killifish
American FlagfishLike what we are building? Buy Archy a bone.
All of this is free for everyone, with a source on every fact, and it will never show ads. It was a big job to build, so if it helped you, buy Archy a bone. Any amount is lovely, and no is a perfectly fine answer too.
Archy is our Australian Cattle Dog and chief taste tester. Tips go to 4V3D OÜ, the small family studio behind Furry Diary.
Where this comes from
Every breed page shows where each fact comes from. If we got something wrong, sorry, we are pet people, not a science magazine. Tell us at support@furrydiary.app and we will fix it.
- Seriously Fish: Nothobranchius rachovii seriouslyfish.comused for range, size, tank, water, diet, behaviour, lifespan, egg storage, maturity
- FishBase: Nothobranchius rachovii, Bluefin notho fishbase.seused for author and year, habitat, length, environment, IUCN status, etymology
- Wikipedia: Nothobranchius rachovii en.wikipedia.orgused for other names, colours and forms, history, lifespan, aquarium notes, life cycle
- seriouslyfish.com seriouslyfish.com
Checked 2026-09-30. Text is written in our own words from these sources.