The Economist's Slash Intelligence Survey

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Long line fishing is a method used to catch tuna out in the middle of the oceans. Boats can drop kilometers worth of line, with hooks and bait connected to discrete intervals. When hauling in the catch, it's typical for just half the fish to be tuna. The rest can be anything from Marlin to Albatrosses. This type of fishing ruins marine ecosystems and is helping to endanger many shark species. New technology may present some hope.

With astonishing speed, the machinery of testing, tracing and lockdowns is being dismantled. We examine the risks that will pose to a country that is not prepared for big outbreaks. A winemaker’s lawsuit in Napa Valley reveals why many Californians believe regulators are unfriendly to business. And a clever solution to spare sharks from becoming unwanted “bycatch”. Help us make the show better: take our listener survey at http://economist.com/intelligencesurvey For full access to print, digital and audio editions of The Economist, subscribe here www.economist.com/intelligenceoffer