Covenant koi

Koi are a species of fish similar to Earth koi and goldfish.

The Covenant apparently make similar use of them as humans do of their counterparts, namely that of a decorative pond fish. A school of fish was kept in one of the Valleys of Tears in High Charity.

List of appearances

 * Halo 2
 * Halo: Broken Circle
 * Halo 2: Anniversary