A recent article in National Fisherman showcased some enterprising tuna boats fishing in the Hawaiian Islands using handlines. They are doing quite well. Historically, the old tuna boats with the multiple bamboo rods did extremely well. In both cases, the tuna resource can be kept at sustainable levels. Introduce purse seines and the like and suddenly we’re taking fish before they ever get a chance to spawn. It doesn’t take a rocket scientist to easily understand what less-than-zero population growth portends.