The damselfish and its garden
In the Caribbean, a damselfish lives beside a patch of algae. It feeds on some of the algae and may chase away other fish that come to graze.
A boundary revealed by chasing
You won’t see a line on the rock. Watch where the damselfish stops chasing and turns back. That gives you a clue to where the area it guards ends.
A damselfish guards its eggs
In the Mediterranean, a male damselfish watches over a rock with eggs attached to it. He stays close while the eggs develop.
