One Piece Encyclopedia

Fishman Karate/Merman Combat

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Merman Combat
Merman Combat Infobox
Japanese Name: 人魚柔術(マーマンコンバット)
Romanized Name: Ningyo Jūjutsu [Māman Konbatto]
English Name: Merman Combat
Literal Meaning: Merman Way of Yielding
Debut: Chapter 619; Episode 538[1]
User(s): Neptune, Fukaboshi
Fighting Style Focus: Water manipulation

Merman Combat is a fighting style used by the merfolk. It is used underwater and involves manipulating the water with their hands as if it were something tangible to use for long ranged attacks. It is in essence, the merfolk equivalent of Fishman Jujutsu.


  • Ultramarine (ウルトラマリン Urutoramarin?): Used by Neptune and Fukaboshi,[2] the user grabs the water with their hands, similar to Mizugokoro, and then hurls it forward in a mighty, extremely large torrent that blasts away his opponents with great force. "Ultramarine" usually refers to a shade of blue and got its name from "ultramarinus", literally meaning "beyond the sea". In One Piece: Gigant Battle! 2 New World, Neptune condenses the water in the atmosphere into his hands as a sphere and launches it forward as a massive torrent.


  • The "Ultramarine" technique resembles the Kamehameha technique, an iconic and powerful energy wave from the Dragon Ball series.


  1. One Piece Manga and Anime — Vol. 63 Chapter 619 and Episode 538, Neptune uses Merman Combat: Ultramarine against the New Fishman Pirates.
  2. One Piece Manga and Anime — Vol. 65 Chapter 641 and Episode 562, Fukaboshi uses Merman Combat: Ultramarine against Hody.

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