Fish

Fish is a blue creature type used for any gill-bearing aquatic vertebrate animal that lacks limbs with digits. Included in this definition are Lampreys, and cartilaginous fishes like sharks, rays and mantas. Related race are Leviathans and Merfolk.

The first creature to bear the type Fish was Manta Ray in Weatherlight (though the Devouring Deep from Legends was later issued errata to become Fish as well).

Dominaria
A devouring deep was under the command of the wizard Coldraith of Golthonor. In the year 1281 by the Reckoning of the Sages of Minorad, the creature attacked people led by the Marked Cleric. Caliphear the Nightmare and Altair of Coloni forced it to reveal its master was Coldraith. The devouring deep was afraid of Merfolk Assassin.

Desert rays are sand-colored creatures that inhabit the Sukurvian Desert. They are forty feet long and are related to manta rays. In prerevisionist continuity they were used by the Sand Warriors for transportation.

On Otaria, people used the Slipstream Eel as means of underwater transportation.

Innistrad
When Emrakul was drawn to Innistrad by Nahiri, several fishermen found themselves fused to their prey, creating large abominations that roamed the sea.

Ixalan
The Stormwreck Sea between Ixalan and Torrezon is home to several gigantic forms of fish, like the Fleet Swallower who is sometimes mistaken for an island.

Mercadia
The swamps of Mercadia are home to the Quagmire Lamprey.

Mirrodin
Several fishes on Mirrodin were also airborne. Most lived near the Quicksilver Sea, but many were driven from their homes when the plane became phyrexianized.

Rath
The Rootwater on Rath was infested with School of Piranha and Hammerhead Shark.

Ravnica
Electric eels live in the sewers of Ravnica's Undercity.(

Fish are also a favorite of the Simic in their creation of Krasis.

Shandalar
Kapsho Kitefins</c> are a breed of flying fish that terrorize the people near the Kapsho Sea.

Tarkir
In the old timeline, the zombified remains of large anglerfish could be found in the swamps of the Sultai. These fish apparently preyed on humans.

Fish are cultivated in the new timeline by the Ojutai clan as food for their draconic masters. Some of these can reach tremendous sizes, such as the Ancient Carp</c>.

Theros
The Hippocampi of Theros are creatures that are half-horse and half-fish.

Zendikar
Many fishes of Zendikar do not only live in the water but can also be found living in the sky. One example of these airborne kinds of fish is the Cloud Manta</c>, who breeds in the ruins found across the skyscape of Zendikar and is sometimes tamed by the local merfolk as a mount. Another is the Windrider Eel</c>, who is sometimes used as a mount by kor skyfishers.

Creature Update
Creature types changed into Fish include:
 * Dandân (Dandân</c>)
 * Devouring-Deep (Devouring Deep</c>)
 * Eel (Electric Eel</c>)
 * Island-Fish (Island Fish Jasconius</c>)
 * Shark (Giant Shark</c>) (reverted with Ikoria: Lair of Behemoths)

Trivia

 * Quagmire Lamprey</c>, and Gurmag Angler</c> are the only black Fish.
 * Windrider Eel</c>, Sky-Eel School</c>, Wormfang Manta</c> and Kapsho Kitefins</c> all have Flying.
 * Skyreach Manta</c> is the only Artifact Fish.
 * <c>Elusive Krasis</c> is a Fish Mutant and <c>Battering Krasis</c> is a Fish Beast.
 * Fish are the source for Fishliver Oil.