fishes with large upturned mouths. The
scientific name for the family, Priacanthidae,
refers to the group’s rough spiny scales. The
earliest identifiable fossils of this family are
dated from 40- to 50-million years ago.
The interesting thing about these fishes is their
ability to change their colour very rapidly.
They can be a deep red and then change to
a pale silver. They may also become mottled or
barred. The change is so profound that they
appear to be different species. Why do they do
this? It may be a form of warning, a form of
camouflage or some secret form of reef-
communication that we as yet do not
understand.