More than 70% of the world's fisheries are currently being harvested at capacity or are in decline, but fish are also delicious and quite good for you. What's a conscientious diner to do? The conventional wisdom has always been to avoid big fish at the top of the food chain--marlins, sharks, and tuna, for example--and focus on little fish, like sardines and anchovies, which have shorter lives and can reproduce more quickly.
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