The world’s fish populations are increasingly endangered from overfishing, pollution, and overconsumption. A study late last year reported that major fish species, including tuna, scallops, lobster, and flounder, could be effectively extinct by the middle of the century. But fishery collapses are not inevitable, says Brian Halweil, senior researcher at the Worldwatch Institute.

Here are Brian’s tips on how to continue enjoying the health benefits of seafood while avoiding fishery depletions and the toxins present in many fish:

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