The Yarrell’s blenny has a long, slender body and two pairs of branched head tentacles above the eyes. A dark ring around each eye extends to a strip down the cheek, this makes its face very distinctive. It is often seen peering out from the rock crevices of the Cork dive sites, at first glance it may look like a sad tompot. It appears also to like the wrecks outside Cork Harbour. The dorsal fin is of uniform height and runs the length of the body. The Yarrell’s Blenny is usually pale yellowish-brown with darker mottling and patches.
The Fish identification books will tell you that this is a species found in northern locations, over the last number of years however sightings by divers in Cork have increased.