According to lots of environmental groups, the world's oceans are being cleaned out, made into deserts where no large edible fish swim (and I like to eat Fish, darnit!). According to Greenpeace.org, this is a direct result of massive (and frequently illegal) overfishing with drift net and bottom-dragging trawling. These operations depend on lax or nonexistent enforcement of fishing boundaries and the economies of scale of very cheap, cubic-mile-capacity nets. Stopping this illegal fishing is crucial to restoring the bounty of underwater life to sustainable levels. Public policy changes will happen as people start starving, but political inertia has its own rules. I'm asking for TECHNICAL, economic ideas to reduce illegal bottom trawling. I've thought of netcutting concrete-anchored (or chained-together) HOok-SCythes (HOSC's) to slash the nets (designs, anyone?). This could also work in the open ocean with neutrally bouyant net-slicers. Razor wire is also good, but ONLY on the bottom or it might entrap and kill whales (though this is hardly a new problem). Any other ideas out there? Remember, keep it inexpensive, there's tens of thousands of square miles of ocean bottom to protect!