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The pelagic ocean covers over 50 percent of the planet's surface and many of the species that call it home travel thousands of miles each year, seeking food and suitable nursery grounds. Some of these species end up in your favorite sushi—like Bigeye tuna—while others are some of the most imperiled on the planet, like leatherback sea turtles. Catching one without catching the other has challenged commercial fishers, scientists and fisheries managers to develop innovative solutions.
