"H. annulatus is the least common of the sea perches and is not often seen. This is due in part to it's habit of living upside-down ""suspended"" from the roof of caves. Like a bat, but underwater. This photo was taken at Shark Point in Sydney."
Monument, Kurnell. The blackbanded seaperch is quite rare, and easily confused with the yellowbanded wirrah flic.kr/p/DWhXZT and banded seaperch flic.kr/p/qhUQqj. One clue is that H. annulatus likes to suspend upside-down in caves