Black Ruff
Centrolophus niger
- Least concern
- Card rarity: Common
- Fish

The black ruff is a medusafish, the only member of the genus Centrolophus. It is a pelagic fish found in all tropical and temperate oceans at depths of 0 to 1,000 m. Its length is typically up to 60 cm (24 in), but it may reach 150 cm (60 in). Other common names include rudderfish and blackfish.
Classification
- Class
- Actinopterygii
- Order
- Scombriformes
- Family
- Centrolophidae
- Genus
- Centrolophus