Sphaerichthys vaillanti

Females in good condition show alternating red and green vertical bands, brighter during courtship.

Males are browner, have a rounder lower jaw and mouthbrood. Colorful individuals are usually female.

Adult length

Up to 5.5 cm (standard length, without the tail fin)

Water temperature

21–25 °C

pH

3.5–6.5

Hardness

0–3 dGH

Natural habitat

Inhabits small creeks with abundant woody debris.

The trade name samurai does not indicate aggression or Japanese origin. Sex differences in color may be unclear in newly imported fish or those in poor condition.