Personally I think that setting up regional processing plants to gut and clean then ice them or freeze them for shipment to a fish canning plant would be a possibility. Can them like you do salmon or mackerel so they could be eaten bones and all. Of course that means you have to develop some method to harvest them on a commercial scale. If this would work long term, it would certainly offset some of the expense of trying to control them in other ways and put some people back to work.