Cabrillo Marine Aquarium is an aquarium in Los Angeles at San Pedro, California. The aquarium interprets both the physical processes of oceanography and marine biology of Southern California by use of displays and educational programs for the public. The aquarium is operated by the City of Los Angeles Department of Recreation and Parks. The original building was a small structure that welcomed visitors until there was a move to a much larger structure designed by Frank Gehry in 1981.The 2004 expansion was designed by Barton Phelps & Associates.