Biology and behaviour

Very little is known about the biology or behaviour of Danionella priapus or the other 3 Danionella species.

Size

D. priapus reaches up to 16mm standard length.

Reproduction

The unusual elongation of the genital papilla and the funnel-like pelvic fins of D. priapus appear to be part of an unusual reproductive strategy - a hypothesis that will have to be tested by further studies.