The Nassau grouper gathers by the thousands for brief annual spawning events at just a handful of predictable sites, which has made it extremely easy to overfish. Its populations have dropped by more than 80% in just a few decades.
What defines this group — Reef fish
The bony fish that live against coral and rock: the living backdrop of almost every dive.
A bony skeleton, scales, and a rigid gill cover closing over the gills.
A swim bladder acts as a float: they hold their depth without swimming.
Many change colour, pattern — sometimes even sex — over the course of their life.