Fish may refer to the following:
- Covenant Koi - A Covenant goldfish found on the level Gravemind.
- Fish (High Ground species) - A species of Fish found on the Halo 3 multiplayer levels, High Ground and Valhalla.
- Fish (Delta Halo) - A species of Fish found on Installation 05 "Delta Halo".
- Fish (Sierra 117) - A species of Fish found on the Halo 3 campaign level, Sierra 117.
- Harvest Whale - Possibly a species of Fish native to Harvest.
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