A fisherman I was speaking to in NZ noted on their ships radar lines of trawlers just outside NZ waters presumably doing the same thing - dragging nets between the trawlers and indiscriminately taking everything - or bottom trawling and mowing the sea floor flat and void of life. It is the tragedy of the commons that we can't manage this shared renewable resource. Canada has destroyed their Atlantic fisheries. If they can't manage not to take every fish in the ocean I'm not surprised the rest of the world can't resist it either.