Team China performs during the team free routine artistic swimming competition at the 19th Asian Games in Hangzhou, China, Sunday, October 8, 2023. (Photo by Aaron Favila/AP Photo)

A puffin swims underwater in search for fish off the coast of the Farne Islands in Northumberland, North East England in the last decade of July 2025. (Photo by Brian Matthews/Solent News & Photo Agency)

A man walks past kelp as he goes for a swim in the Pacific Ocean at La Jolla Shores, Thursday, July 24, 2025, in San Diego. (Photo by Gregory Bull/AP Photo)

Grey seals show their playful side while swimming off the English coast, UK in the last decade of May 2025. (Photo by Brian Matthews/Solent News)

A diver dressed in a Santa Claus costume swims with a penguin at Sunshine Aquarium during preparations for the upcoming Christmas special event in Tokyo on December 1, 2025. (Photo by Kazuhiro Nogi/AFP via Getty Images)

“The finless porpoise (Neophocaena phocaenoides) is one of six porpoise species. In the waters around Japan, at the northern end of its range, it is known as the sunameri. A freshwater population found in the Yangtze River in China is known locally as the jiangzhu or «river pig»”. – Wikipedia

Photo: A newly born Yangtze finless porpoise (top) swims with his mother at the Hydrobiology Institute of the Chinese Academy of Sciences on June 3, 2007 in Wuhan of Hubei Province, China. (Photo by China Photos/Getty Images)

“Yokohama Hakkeijima Sea Paradise is an amusement park consisting of an aquarium, shopping mall, hotel, marina and amusement rides. It is located in Kanazawa-ku, Yokohama, Japan. It opened for business on May 8, 1993”. – Wikipedia

Photo: Shoal of sardines and sharks swim in a tank at Yokohama Hakkeijima Sea Paradise on March 19, 2009 in Yokohama, Japan. (Photo by Junko Kimura/Getty Images)

A participant dressed as a mermaid goes to swim in the beach after taking part in the Annual Mermaid Parade in Brooklyn, New York, June 18, 2016. The annual parade, founded in 1983, seeks to bring mythology to life for residents, create confidence in the district and to allow artistic self-expression in public, according to the parade's website. (Photo by Eduardo Munoz/Reuters)