Science: Hot Fence

The slimy, unattractive sea lamprey, which spends its life gnawing holes in fish, has practically conquered the Great Lakes. Since the first invasion of lampreys by way of the Welland Canal (TIME, June 16, 1947), they have almost wiped out the lake trout and are now going after the whitefish. The loss in trout alone, according to the U.S. Fish & Wildlife Service, is costing fishermen some $3,200,000 a year, and the lampreys have only begun.

Last week came the first good news for fishermen, the first bad news for lampreys. The Cook Electrical...

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