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Nothobranchius eggersi, adult male left-facing AI illustration; Blue phenotype adult male; reference locality retained, artwork locality not certified

Eggers’ killifish — blue phenotype

Nothobranchius eggersi

The blue phenotype has a pale patterned tail; red forms remain the same species.

The blue male has a pale-blue flank, irregular rear bars and pale median fins with red-brown marks and whitish edges. Red phenotypes have red tails and reticulation.

Adult length
Up to 3.9 cm (standard length, without the tail fin)
Water temperature
24–28 °C
Lifespan
0.5–1.3 years
Natural habitat
Inhabits temporary pools and swamps.

Wild water is 29.5–31.5°C, but do not keep it at constant high heat. Warmer racks suit it.

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Appearance and identification

From seasonal coastal Tanzanian waters. Blue and red phenotypes are one species; locality lines differ, and colour alone cannot identify them.

Same-species behaviour

Keep colour forms and locality lines separate and avoid crosses.

Space requirements

Keep feeding visible and allow separation.

Diet and feeding

Match small animal foods to size. Fry take Artemia.

Compatibility limits

Check feeding, pursuit and size differences. A shared genus does not guarantee compatibility.

Aquarium environment

Removable spawning media make egg management easier.

Sources

wildnothos.wixsite.com ↗ 2026-10-22

www.fishbase.se ↗ 2026-10-25

killis.org.uk ↗ 2026-10-22

wildnothos.wixsite.com ↗ 2026-10-22

nothos.org ↗ 2026-10-22

api.gbif.org ↗ 2026-10-22

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