The messmate pipefish (Corythoichthys haematopterus) is a species of marine fish in the family Syngnathidae.

It is widespread throughout the tropical waters of the Indo-Pacific region, from the eastern coast of Africa to the Vanuatu Islands.

[2] It occasionally makes its way into the aquarium trade where it is known as the dragonfaced pipefish.

[1] The messmate pipefish exhibits biofluorescence, that is, when illuminated by blue or ultraviolet light, it re-emits it as yellow, and appears differently than under white light illumination.

Biofluorescence may assist in intraspecific communication and camouflage.