Nang Tien Ca

"Merliah is an excellent swimmer and surfer, and one day she discovers she can breathe underwater. She meets Zuma, a pink dolphin, who tells her that her mother is the mermaid queen of Oceana; When Merliah travels to Australia for a surfing tournament, a jealous competitor steals her mermaid magic and releases the evil Eris from her prison, and Merliah must save the mermaid kingdom without her mermaid powers"--records for English editions.