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 began in 1935 as a collection of marine specimens stored in the Cabrillo Beach Bathhouse.

They also created a non-profit, called the Friends of the Cabrillo Marine Aquarium, to assist in funding.

Free-standing tanks served by exposed electrical and plumbing systems openly display mechanical functions.

[4] In 2000, Los Angeles commissioned Barton Phelps & Associates to prepare a master plan for a phased expansion.