Fish

A fish is any member of a paraphyletic group of organisms that consist of all gill-bearing aquatic craniate animals that lack limbs with digits. Different types of fish exist on human-occupied worlds, Sanghelios, and Forerunner installations, and there were even fish on High Charity before it fell. An ice shark is a type of shark found in the waters of Draco III.

Gameplay
In the level Regret in Halo 2, fish are able to swim through and inside the underwater gondola.

In Halo 3, fish appear as yellow blips on the player's heads-up display.

In Halo: Reach, fish can be killed by the players, at which point they will float to the surface of the water and bob around.

List of appearances

 * Halo 2
 * Halo 3
 * Halo: Reach
 * Halo: Broken Circle
 * Halo 2: Anniversary
 * Halo: New Blood
 * Halo 5: Guardians
 * Halo: Shadow of Intent
 * Halo Wars 2
 * Halo Infinite