I'm not saying that cumulative effects are not important to address but with limited resources you have to have priorities and address those in order of importance to your goals. If you goal is a pristine ocean and zero impact on species then yes shut down the aquarium trade, get all the tourists out of the water and start handing out a limited number of day passes. If I lather up on sunblock and go surfing I'm adding chemicals to the ocean environment. Do we worry about that particular activity? No, of course not because it's impact is infinitesimally small compared to someone running a charter boat all day, day after day pumping unburned fuel into the water because of old, outdated motor technology. We look at these two impacts and decide which one we, as a society, can and want to address. My point is that the impact of a properly managed fishery is ridiculously small given the huge amount of ocean area we are talking about - the island chain is 1500 miles long.