White's Seahorse Identification Guide

Key identification features

• Coronet is tall with five distinct, backward-pointing spines resembling small antlers, clearly visible from the side
• Moderate-length snout, not as long or thin as many tropical seahorses
• Deep, laterally compressed body with a subtle ridge along the back and short spines over the eyes
• Coloration ranges from mottled brown and grey to yellow or orange, sometimes with darker blotches or fine white speckling
• Grows to roughly 13-16 cm and often perches upright, tail curled around a holdfast

Common look-alikes

• Spotted seahorse: coronet is low and smooth, lacking sharp backward-facing points
• Big-belly seahorse: larger overall, with a more inflated abdomen and a flatter, less spiny coronet

Where you'll see one

White's seahorse is found along temperate and subtropical eastern Australia, especially around Sydney Harbour and nearby estuaries. It clings to soft corals, sponges, seagrass blades, and increasingly to artificial structures such as jetty pylons, swim nets, and boat moorings, usually in relatively shallow, sheltered water less than 25 meters deep, where it stays close to a single home site for extended periods.