Aquaculture provides seafood in a warming world. But this global industry is taking a staple called sardinella from the mouths of people who need it the most.
From the shrimp ponds of China's river deltas to the salmon cages of Norway's fjords, the industry thrives by feeding fish to other fish. Its needs are so voracious, roughly 20 percent of the world's wild-caught fish don't even go near anyone's plate but are instead ground up to make fishmeal.
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