A small but deep bodied wrasse with a very small mouth and thick lips, the Rock Cook, Ctenolabrus exoletus, is more common in the north and west and apparently absent on the east coast. It is a warm brown on the back, shading to greenish yellow on the side with blue lines on the head and back. These are more distinctive in breeding males. Growing to about 15cms, the Rock Cook is found in fairly shallow water where it feeds on invertebrates. It is one of the few fish around our shores which acts as a cleaner of other fish.
Also called the Small-mouthed Wrasse