Gastrodermus undulatus

Males can become very dark with bright pale spots; the sexes differ noticeably in pattern.

Males can become very dark with bright pale spots, and the sexes differ noticeably in pattern. This species often swims above the substrate in open water.

Adult length

Up to 4.4 cm (standard length, without the tail fin)

Water temperature

22–26 °C

Lifespan

5–10 years

Natural habitat

Native to the lower Paraná basin and coastal rivers in southern Brazil.

Quoted maximum length excludes the tail.