The current arrangement is primarily self-enforced. The excursion boats have to be registered with the Reserve Naturelle to operate in teh Reserve (including Tintamarre) and they have no interest or need in getting into a fight with the Reserve. All of the captains keep (and I think generally have) a good relationship with the Reserve. I think that currently the Reserve Naturelle has three rangers who have police powers and then there is the gendarmerie maritime (the maritime police). You just would not want to mess with any of those guys. Particularly as a tourist, if one of them "requested" you to do something, you would do it and thank them for it.