Giant Moray (Gymnothorax javanicus): The Moray Eel looks vicious but is really a softie (so we are told). It can grow up to 2.4 metres weigh 30 kg and is usually docile. However, it is a canivore and is equipped with very sharp fangs which it uses for grabbing passing fishes. So don't get on the wrong side of a Moray. Usually seen during the day with just its head visible from a hole or gap between rocks, the Giant Moray can be identified by the numerous small dark spots on the head and back. Morays undergo a sex change during growth changing from male to female.