SimonB, you are totally missing the point of the argument shown by your leading question. Unless your premise is that fish should not be harvested and eaten, then the question is how is the best way to harvest the fish. I challenge anyone to make an argument that any other method of harvesting fish is less detrimental to the sustainability of the species than spear fishing.

This topic has come up before, and it always seems that some are opposed to spear fishing but have no argument or facts that support any better way to put a fish on the dinner table.