this is so common of some photogs at the BHB, that unless I ignore it I do not get to enjoy my dive.
Which gets to the issue of all the "user groups" competing for the use of the BHB Marine park....the fisherman, the sightseer divers, the student divers and instructors, the photographers that do wide angle, the point and shoot photogs, the macro photogs, and the super macro photographers..and, the collectors, the snorkelers, and the waders and swimmers in the local beach going population.
So each group has an IMPACT on the health of the marine life it comes in contact with. Some user groups have much lower impact than others, obviously.
A class of 20 students doing their first roto-tilling tour of the BHB, with no skills taught to them yet, kicking the bottom and dragging guages the whole way as they go.... is likely to be among the highest impact, most damaging group.
In the scheme of things, just walking and standing in the waiste deep water off the beach, with fins on, is going to spread huge amounts of silt, and this is a zone that actually has many of the rare life forms living on the bottom--right where divers and dive classes congregate, and stomp all over the bottom, as if it was the floor of someone's living room.
The macro photographers, and super macro crowd, are very plugged in to what lives in this zone, and from what I have seen, most try hard to have minimal contact with the bottom where the hordes are standing and congregating. When they lie down, they do so with very low pounds per square inch weight on the bottom life--they spread their weight out carefully and gently, and they try to avoid kicking anything...some are much better at this than others, obviously--but most try hard at this idea of gentle contact.
I do not believe that pushing a black slate under a 2mm long nudibranch, is anywhere near as DAMAGING to this marine life, as is the walking around on top of hydroids and sea grass and on top of nudibranchs, that will take place by the hordes of unknowing divers.
This is one of the reasons I wanted to stick up for DD, as the impact I see him having on the health of marine life, appears to me to be far below the impact of most of the divers walking all over the bottom, for long periods of time.