Here we see a large, venomous Stonefish (Synanceia verrucosa). It has camouflaged itself deep in the sand to await passing prey. Stonefish are the most venomous fish in the world and can be lethal to humans. Coral reefs are the one of earths most complex ecosystems, containing over 800 species of corals and one million animal and plant species. The location is Ko Haa, Andaman Sea, Krabi, Thailand.