** ADVANCE WEEKEND MARCH 31- APRIL 1 ** Bluefin tuna are shown inside Maricultura’s tuna pens prior to harvest, March. 5, 2007 near Ensenada, Mexico. Pacific bluefin tuna leave Japan’s coastal waters and swim east to school off California and Mexico. They return by nonstop flights from Los Angeles International Airport as slabs of fresh toro, the “foie gras of the sea.” (AP Photo/Chris Park)