Istiblennius edentulus
Look for Rippled Rockskipper in the shallows of Orchid Island, Taiwan and Saint-Paul, Reunion, year-round in 25-29C water.
A small, stocky blenny reaching about 11 cm, mottled in browns and greys that break up its outline against algae-covered rock. Look for the blunt head, close-set eyes topped with small fleshy cirri (branched tufts), and a body that tapers to a rounded tail fin. It often rests propped on its pectoral fins, angled slightly upward, rather than swimming in open water.
Spend most of a dive or snorkel in water shallower than 5 metres, wedged into rock crevices or perched on wave-washed reef flats where surge and light are strongest. It grazes on algae films over rock and dead coral, darting short distances rather than swimming freely, and tends to hold still or retreat into a crevice when a diver approaches rather than fleeing far. Best looked for on shallow reef flats and rocky margins, often in the same spot dive after dive.
Its habit of sitting in the shallowest, most turbulent part of the reef means it is often easier to find snorkelling or freediving the surf zone than on a deeper dive.
No clear seasonal pattern shows up in the sightings, and its comfort range of roughly 25 to 29C covers most of the tropical year, so it is a year-round find at shallow reef edges.
Reef neighbours a diver could mistake it for. Use the identification notes above to tell them apart.
Most reliably found around Orchid Island in Taiwan, and a strong presence at Saint-Paul in Reunion and across the Visayas in the Philippines. Divers and snorkellers also log it regularly around Muscat in Oman, Blue Bay in Mauritius, and Queensland in Australia, plus occasional sightings in South Africa's KwaZulu-Natal and Israel.
Mapping where Rippled Rockskipper is logged…
Best chances are around Orchid Island in Taiwan, Saint-Paul in Reunion, and the Visayas in the Philippines. It also turns up around Muscat in Oman and Blue Bay in Mauritius, always in shallow reef-flat habitat.
There is no strong season in the sightings data. It sits comfortably in 25 to 29C water, so it can be found on shallow tropical reefs at any time of year.
Look for a small, mottled brown-and-grey blenny around 11 cm long, perched on rocks in very shallow water with small fleshy tufts above the eyes. It rests propped on its pectoral fins rather than swimming freely.
They reach about 11 cm, making them one of the smaller reef fish you will spot while snorkelling shallow rocky edges.
No. They are harmless herbivores that retreat into crevices when approached rather than showing any defensive behaviour toward divers.
Site and sighting data is aggregated from diver logs, iNaturalist and GBIF. For taxonomy and conservation status:
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