Fish

A fish (さかな) is any member of a paraphyletic group of organisms that consist of all gill-bearing aquatic craniate animals that lack limbs with digits. Fish are abundant in most bodies of water. They can be found in nearly all aquatic environments, from high mountain streams to the abyssal. Humans value fish from their value in food content to their beauty regarding many species.

Appearances
Note that this page only includes real (or realistic) fishes, as many robots and programs, such as Lantern Fish, Anglerge, Splash Warfly, Lurerre the Abysroid and SharkMan.EXE, are based on fishes.

Mega Man Zero 3
Flying fishes appear in the Resistance Base with the use of the Mod Card #70 Volteel Biblio. ZeroXorZ can attack the fishes, and doing so continuously will make a flying fish drop an Energy Crystal.

Mega Man Legends
The Flutter has an aquarium with small fishes, and a man from Kattelox Island mentions that Lake Jyun has lots of trout.

Mega Man Legends 2
Fishes can be seen swimming in the Nino Ruins.

The Misadventures of Tron Bonne
Fish is an item that can be obtained by sending Servbots inside houses from Gold City, under water in the harbor stages, and in scouts around Ryship Island. Each fish can be sold for 200 Zenny.

Mega Man Battle Network series
The character Masa works on a fish stand. In the MegaMan NT Warrior anime he often makes references to fishes and calcium, and is occasionally seen holding fishes. In the MegaMan NT Warrior manga Masa gives several fishes to Lan after their Net Battle.

The Seaside Town from Mega Man Battle Network 6 has an aquarium with several types of fishes, including tropical fishes, sunfishes, piranhas and sharks.