Science: Herring Herding

Even for fish, herring are not bright; to them a curtain of air bubbles looks like a stone wall. Taking advantage of this lack of judgment, the U.S. Bureau of Commercial Fisheries is trying out an ingenious system of herding schools of herring into fishermen's nets.

Trials were conducted among the craggy islands in Casco Bay, near Portland, Me., where dense schools of herring drift through twisted channels. Traditionally, Maine fishermen float long nets out into the channels to shunt the herring into the waiting traps. But such nets have drawbacks. They need constant...

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