This is a very hard subject to really answers, but I will take a stab at it. Here in the USA, we do a fairly good job on the regulations, of course some things slip by. The problem comes when we start talking about countries that are very poor and are trying to fish and trade to put food on the table. What we need to do is help educate them on the impacts of their actions on the ecosystem. The fish and coral may be plentiful now, but if you keep going the route they are going, it will fall rapidly. I know a few countries have been enforcing regulation on trade and fishing to bring more tourists in, and that has seem to help both the locals and the ecosystem.