This family is
most commonly found in the Indo-Pacific. The distinct first dorsal spine
can be locked in an erect position. If the fish is threatened or caught
it can raise the dorsal spine and can lock itself in cracks or crevices
in the reef to prevent it from being pulled out. The balistid fish usually
swim by undulating movements of the second dorsal and anal fin. The tail
is used occasionally for rapid short movements. Triggerfish have the ability
to use their swim bladder to produce a grunting sound that you can hear
when diving on the reef. The very famous fish with the long Hawaiian name
(the state fish of Hawaii: Humuhumunukunuku apua'a, featured
above) belongs to this family.