LAWRENCE NAYLOR / SCIENCE PHOTO LIBRARY LAWRENCE NAYLOR / SCIENCE PHOTO LIBRARY
Porkfish and grunts shoaling together. The Panama porkfish (Anisotremus taeniatus, yellow) and spottail grunt (Haemulon maculicauda, silver) both inhabit the tropical eastern Pacific Ocean. Both are considered good food fish, and both can reach around 30 centimetres in length. It is thought that fish form shoals to protect themselves against predators. Individual fish are hard to target amongst a rapidly shifting shoal, and the great number of fish makes the shoal better at detecting predators than an individual fish would be.
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