As the title states, the current Sea Lion and Otter show at SeaWorld closes forever 3/15 for the installation of a new show. From the SeaWorld PR Tip Sheet press release:

MARCH 2009
GET READY TO ‘SPRING INTO NIGHT’: SeaWorld stays open late so guests have more time to enjoy all their SeaWorld favorites, plus special nighttime entertainment during Spring into Night, April 4–19. SeaWorld’s springtime soiree features the park’s newest sketch-based comedy sea lion show starring Clyde and Seamore; “Shamu Rocks,” a nighttime killer whale show that takes a musical journey through remarkable settings around the world; "Ignight," a high-flyin' nighttime dolphin show featuring special music and pyrotechnics; and “Shamu’s SkySplash” fireworks each night. Park hours during Spring into Night are 9 a.m. to 9 p.m. For more information, call (800) 25-SHAMU or visit www.seaworldsandiego.com.