Thetford Reef, off Cairns on the Great Barrier Reef, is almost 2 kilometres long with scattered coral heads, sandy floor in-between and lots of swim-throughs. Look for giant clams, butterflyfish, rabbitfish, damsels, angelfish and pipefish, large gorgonian fans and soft coral. Anemones host commensal fish, and boulder coral heads have multi-coloured Christmas worms. The area is home to larger pelagic fish, including mackeral and tuna; also trevally, wrasse, spangled emperor, red bass, blue and gold fusiliers and sergeant majors.
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