In the pitch blackness before dawn one morning in late may, four boats belonging to Diego Crespo Sevilla chug out of a port in southwest Spain to enact an elaborate marine ambush. About 50 fishermen drop hundreds of red markers, attached to nets, which bob for nearly 2 km along the water's surface, forming
rows
as neat as traffic lanes on a highway. Then they maneuver their boats to form a wide square, and they wait. As the sun rises an hour
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later, a drama begins to unfold. Nearly 200 huge tuna glide through the lanes...