Fish monsters are among the least supported types in the game, if not the absolute least supported type. Recently, however, Tactical Evolution and Phantom Darkness sets have released some new Fish that make using them a viable strategy, including a possible trump card in "Superancient Deepsea King Coelacanth." Fish are excellent sychronizers, as many of their effects require the presence or tribute of other Fish to activate.

Some of the better Fish monsters include: "Fortress Whale", "Terrorking Salmon", "7 Colored Fish", "Cranium Fish", "Abyssal Kingshark", "Amphibian Beast", "Ocean's Keeper" "Superancient Deepsea King Coelacanth","Golden Flying Fish", "Deepsea Macrotrema" and "Thousand-Eyes Jellyfish".

Support cards include "Umi" while weakness include "Eternal Drought".

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