Black rudderfish, also known as the pilot fish, is a deep-water fish found in the Atlantic Ocean. This fish is known for its distinctive black color and its rudder-like shape. Interestingly, there are several synonyms for the black rudderfish, depending on the region and the language. In French, it is known as "thon pilote noir," while in Spanish, it is referred to as "pez piloto negro." In some parts of the world, it is also called the black dolphin fish, black tuna, or black skipjack. Although the names may vary, they all refer to the same unique and elusive fish.