ALEXIS ROSENFELD / SCIENCE PHOTO LIBRARY ALEXIS ROSENFELD / SCIENCE PHOTO LIBRARY
Tiger grouper (Mycteroperca tigris) on a reef. This is a predatory fish that feeds almost exclusively on other fish, which it leaps on from ambush. It can reach a length of around a metre. The fish changes sex during its life, starting off as female but turning male as it grows. All fish below around 40 centimetres in length are female, with males being larger than this. This trait is known as protogynous hermaphroditism. Photographed off Conception Island in the Bahamas, in the Caribbean Sea.
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