In the Japanese anime cartoon "Marine Boy", what was the name of the dolphin he could communicate with?

"Marine Boy" was one of the first color anime cartoons to be shown in a dubbed form in the U.S., and later in Australia and the United Kingdom. It was originally produced in 1965 in Japan as "Undersea Boy Marine" ("Kaitei Shōnen Marin") by Minoru Adachi and animation company Japan Tele-Cartoons.

It was sold outside Japan via K. Fujita Associates Inc., with Warner Bros.-Seven Arts Television handling worldwide distribution of the English-language version. The series was distributed in syndication in the United States starting in 1966.

Marine Boy is an extremely intelligent, strong and athletic boy of perhaps 13 to 15 years of age. He is a martial artist, football player, and an accomplished pilot whose talents are further enhanced by the inventions of his father, Dr. Mariner. He has a great affinity with sea life, most particularly with a white dolphin he calls Splasher who Marine Boy occasionally seems able to communicate with quite clearly. (he also wears a ring with a dolphin-calling whistle in it).