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Jaws is our Yellow Headed Jawfish - Opistognathus aurifrons - and is one of the most entertaining and active residents in the tank. Jawfish as the name suggests have large and powerful jaws which they use to move stones and gravel around to build protective burrows.

Previously our tank had an aragonite sand base, so to get things ready for Jaws' arrival we cleared some of the sand from one end of the tank and added about 10kg of crushed coral along with various bits of shell and small rocks to give him some construction materials. Pretty soon he had built his first home, and he's been busy ever since rebuilding and adjusting his burrow.

During the day he bobs his head in and out of the burrow, emerging whenever there's food about. In the evening he pulls a few stones over the entrance and disappears for the night.