An oceanarium can be either a marine mammal park, such as MarineLand, or a large-scale aquarium, such as the Lisbon Oceanarium, presenting an ocean habitat with marine animals, especially large ocean dwellers such as sharks.
Marineland of Florida was developed as Marine Studios near St. Augustine in Marineland, Florida, which was followed in Florida by Miami Seaquarium, opened in 1955 and in California by Marineland of the Pacific, opened in 1954 near Los Angeles, and Marine World, Africa USA, opened in 1968 near San Francisco.
SeaWorld San Diego was opened in 1964, developed by four fraternity brothers Milt Shedd, Ken Norris, David DeMott and George Millay. SeaWorld Aurora opened in 1970 near Cleveland, Ohio. SeaWorld Orlando was opened in 1973. SeaWorld (San Diego, Aurora, Orlando) was sold to Harcourt Brace Jovanovich (a publishing company listed on the New York Stock Exchange) in 1976. They purchased Marineland of the Pacific in 1986 and closed the park. They had opened SeaWorld San Antonio in 1988. In 1989 they sold SeaWorld (San Diego, Aurora, Orlando, San Antonio) to Anheuser-Busch, the world's largest brewer and owner of the Busch Gardens Safari Parks, for US$1.1 billion. In 2001, Anheuser-Busch sold the Ohio park which finally ceased its activities in 2004.
When the 170,000-square-foot Oceanarium at the Shedd Aquarium in Chicago opened on April 27, 1991, it debuted as the largest indoor marine mammal facility in the world. The position as world's oceanarium has since shifted repeatedly in recent years. From 2005 to 2012 it was the Georgia Aquarium in the United States with an initial total water volume of 32,000 m3 (8,500,000 US gal), later it expanded to 38,000 m3 (10,000,000 US gal), and home to 100–120,000 animals of 700 species. In 2012 it was surpassed by Marine Life Park in Singapore with a total water volume of 45,000 m3 (12,000,000 US gal) and over 100,000 animals of more than 800 species.  In 2014, the Singapore park was surpassed by the Chimelong Ocean Kingdom in China, the current record holder, with a total water volume of 48,750 m3 (12,880,000 US gal). 
Modern marine aquariums try to create natural environments. A host of marine animals swim together in the four-story cylindrical tank of the New England Aquarium in Boston, which opened in 1969. At the National Aquarium in Baltimore, which opened in 1981, a walkway spirals up through the center of two gigantic cylindrical tanks, the Atlantic Coral Reef and the Shark Alley, which display sharks, sawfish, and other sea creatures. Since then, many new aquariums have sought even greater realism, often concentrating on local environments. The richly endowed Monterey Bay Aquarium in California, which opened in 1984, is an outstanding example. 
The Afrykarium is the only themed oceanarium devoted solely to exhibiting the fauna of Africa and located in Wrocław, Poland. A part of the Wrocław Zoo, the idea behind the Afrykarium is to comprehensively present selected ecosystems from the continent of Africa. Housing over 10 thousand animals, its breadth extends from housing insects such cockroaches to the large mammals like the elephants on an area of over 33 hectares .
- Manila Ocean Park
- Moscow Oceanarium
- Nordsøen Oceanarium, Hirtshals, Denmark.
- Public aquarium
- UnderWater World Guam
- "World's largest oceanarium opens". CNNGo Staff. CNN. 2012-11-22.
- "China's Hengqin Ocean Kingdom confirmed as world's largest aquarium as attraction sets five world records". Guinness World Records. 31 March 2014. Retrieved 9 November 2017.
- Taylor, Leighton R., Aquariums: Windows to Nature, Prentice Hall General Reference, New York, 1993. ISBN 0-671-85019-9
- Isler, Danuta. "A trip to Wroclaw Afrykarium". Radio Poland. Radio Poland.
- Lou Jacobs, Wonders of an oceanarium: The story of marine life in captivity. Golden Gate Junior Books, 1965.
- Joanne F. Oppenheim, Oceanarium. BBooks, 1994. ISBN 0-553-09520-X.
- Patryla, Jim. (2005). A Photographic Journey Back To Marineland of the Pacific. Lulu Publishing. ISBN 978-1-4116-7130-0.
- Brunner, Bernd. The Ocean at Home: An Illustrated History of the Aquarium. Reaktion Books, 2011.