Ghostpipefishes are related to seahorses and pipefishes, and are found in tropical waters of the Indian Ocean. They can often be floating motionlessly in pairs, with their mouth pointing downwards. Ghostpipefish are masters of camouflage, with their unique shape disguising them as seagrass and coral.
The robust ghostpipefish is highly variable in colour, ranging from grey to green. They are the largest species of their family, with a maximum length of 15 cm (5.9 in).