So far Maine lobstermen have managed their fisheries well by limiting the number of licenses available, and the number of traps any individual can set out. There's also an upper limit to the size of a lobster that can be caught and sold so they may continue to thrive as breeders; there are no such limit in Canada or states to the south of Maine that I am aware of. Still Maine lobstermen might not be harvesting record landings if lobster predators (fish) were not in such short supply.