Children watch as the Swell Sharks get fed at the Santa Monica Pier Aquarium (SMPA) during Heal the Bay's annual Ocean Appreciation Celebration on Sunday, July 31, 2011. The sharks are fed twice weekly on Tuesdays and Sundays at 3:30PM. This year's annual tribute to the ocean at the Santa Monica Pier Aquarium focused on the four habitats of the Santa Monica Bay: the sandy bottom, the kelp forest, the rocky shore and the open ocean.