The finless porpoise is a member of the family of small dolphins. It lives from Kyushu to Tohoku and prefers shallow waters up to 50 m deep.
It is said that they are becoming difficult to live due to water pollution and coastal reclamation, and Osaka Prefecture has designated them as "species at increasing risk of extinction" The aquarium "Kaiyukan" in Osaka has been conducting surveys on a boat with vocational school students and the general public to learn more about the ecology of finless Porpoises.