Mad Doctor Fish

Mad Doctor Fish (マッドドクターフィッシュ, Maddo Dokutā Fisshu) are mysterious beings and part of the Monster Association. They live in a sort of symbiotic relationship with Evil Natural Water.

Appearance
The Mad Doctor Fish's appearances are based on red garras (also known as doctor fish), but they have larger jaws and sharper teeth that bear a resemblance to carnivorous piranhas. They also appear to possess an unusual six eyes.

Monster Association Arc
The Mad Doctor Fish are seen swimming in the fish tank containing Evil Natural Water. A monster breaks the tank holding Evil Natural Water, releasing it as well as the fishes, to attack Atomic Samurai's Disciples. They devour the monster that released them, and Evil Natural Water then launches them at Iaian, but he easily slices them up.

More Mad Doctor Fish appear when Evil Natural Water attacks Child Emperor, again launching them at its target. They chew up some of Child Emperor's backpack's arms and weapons, but he manages to dispose of most of them.

Abilities and Powers
Because their collective threat level is Tiger, it can be implied that the Mad Doctor Fish are not extremely powerful. However, they still act as an effective means for Evil Natural Water to conduct long-ranged attacks.

Physical Abilities
Powerful Bite: Mad Doctor Fish have a strong bite that can easily pierce the flesh of other mysterious beings. They are able to completely devour weaker and wounded opponents in seconds, and could even chew through Child Emperor's metal weapons to break them.

Trivia

 * They are the only monsters in the series so far to live in symbiosis with another.

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