IMHO scallops should be dived for, not dredged or trawled. Obviously diving will reflect in the scallop price, as it should, since they are a delicacy. This isn't sustainable. I've seen the bottom of the Baltic sea (3D sonar) it is has miles and miles of groves from the trawlers. Sure this might not be comparable as the Baltic isn't the most diverse ecosystem, but it has seagrass meadows and quite a number of smaller animals. This goes for all food sources, no harm in eating something special occasionally of sustainable origin. Edit: oh and quotas based on population, obviously.