As the tide fell, a couple of these fish were stranded on the sand. Perhaps they were corralled by predatory fish into the shallows as the tide fell. This fish was only a couple of inches long. We sometimes see them darting around the pools left by low tide, usually on their own.
We would guess this Slippery Dick was an initial phase, based on its colours. Slippery Dick can reach up to about 9 inches in length. They are usually found swimming about reefs near areas of sand and grass. Small protruding teeth are used to graze the bottom for snails, worms, crabs, shrimps and eggs.