Of course this depends a great deal on whether the fish are conditioned to the presence of divers. In our dive park, most of them see us as part of the environment and don't seem to mind close approaches unless the movements are sudden or threatening.
When I dived the Sea of Cortez regularly, I noticed many species that were skittish in front of my camera elsewhere in the region were not bothered much by it near Cabo where divers are much more common.
When I dived the Sea of Cortez regularly, I noticed many species that were skittish in front of my camera elsewhere in the region were not bothered much by it near Cabo where divers are much more common.