Another opinion is, if sustainably collected the reefs will have the collectors protecting them. MO is one of the greatest values economically for a reef. If you take that away from the fisher folk, they not only have no more real incentive to protect it, they typically fall back on subsistence fishing of which the predators are depleted rather quickly, then on down the line.
Breeding fish takes power.. most power production is from fossil fuels (oil, coal, natural gas, etc)... burning fossil fuels is what some speculate is causing the demise of reefs.
On the other hand, so does flying fish half way around the world in plastic bags and styrofoam.