A hunk of romaine was easy pickings for Porkchop and her three flippers. On a rainy day last week, the green sea turtle pumped her limbs and stretched her beak up to chomp a lettuce leaf floating on the surface of a tank at the Aquarium of the Pacific in Long Beach. That's where she's been on the mend since early March, when she arrived with a hook lodged in her throat and a flipper that was mostly dead from fishing line that had choked off circulation.