Not sure if this species has a name yet, previously H. histrix.
photo by Wolfgang Holz
We found this spotted trigger fish underneath a floating buoy. Apparently not known in the Lord Howe Island waters
ID based on distinctive silhouette and swimming style. Screen shot from YouTube video here: https://youtu.be/s0tI59WQoEw?t=14m41s
Underwater coral reef
Image credit: Marie Fontaine from Canada