A metal that reacts with seawater to produce an electric field may help keep sharks at bay. But the idea isn't to protect humans from shark attacks. Just the opposite: scientists hope the metal will save sharks from senseless deaths in fishing nets.

An estimated 11 million to 13 million sharks die each year as "bycatch," collateral damage in the hunt for other fish. Sharks grow slowly and can take many years to reach reproductive age, so their populations are being severely impacted by fishing.

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Divers have spotted a new type of fish off Ambon Island in Indonesian waters. The striped fish, which is about the size of a human fist, is believed to be an anglerfish because it crawls along the ground and into crevices using leglike pectoral fins.

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Welcome to the prey’s-eye view of the three-spined stickleback. Mark Purnell, a research fellow at the University of Leicester in England, stained the fish to highlight the skeleton and examined surface textures on the teeth. Each tooth is about the width of a human hair, and its texture indicates what the fish ate.

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The fact that nearly three quarters of the world’s fisheries are dangerously close to depletion makes aquaculture seem like our only chance at meeting the ever-growing demand for seafood. But it takes fish to grow fish: Most of the fish meal used in today’s aquaculture feed is made from small, oily specimens such as anchovies and sardines. A huge load of these “forage” fish—roughly a third of the global catch—is turned into fish meal every year.

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