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The future of fishing is even more exotic, to judge by the U.N. fishing congress held recently in London. Japan is trying out salt-pond "farms" on the Inland Sea, where yellowtail and sea bream are raised and dumped into the adjacent sea when grown. England is farming plaice somewhat in the manner that trout rivers are restocked. The 600 delegates from 50 fishing nations at the congress also saw the coming use of underwater television, fish hunts by submarine, fish herding by means of electric fences or bubble barriers, unattended sonic devices that could float like logs and signal the approach of schools—and even fish mating calls simulated by scientists as potent lures. Some day, as countries turn more and more to the sea to feed their growing population, the hunters may all become scientists, and the ancient sea may finally be persuaded to yield a harvest.