Thunnus atlanticus, commonly known as the blackfin tuna, is a species of tuna found in the western Atlantic Ocean. It is recognized by its dark dorsal fin and a sleek, metallic-blue body. Blackfin tuna are known for their speed and agility, often traveling in schools and feeding near the ocean surface. They primarily inhabit warmer waters and play a crucial role in marine ecosystems as both predator and prey.

Thunnus atlanticus, commonly known as the Blackfin Tuna, is native to the western Atlantic Ocean. Its geographical distribution includes the waters from Massachusetts, USA, south to Brazil, including the Gulf of Mexico and the Caribbean Sea.

Blackfin Tuna typically inhabit warm, tropical, and subtropical waters. They are often found in surface waters and are known to favor areas where water temperatures range between 20°C and 30°C.

As a pelagic species, the Blackfin Tuna occupies the open ocean environment, typically in the epipelagic zone (the uppermost layer of the ocean where sunlight penetrates). This species is known for its migratory behavior, often forming schools, and is a predator of smaller fish and invertebrates, such as squid and crustaceans. It plays a crucial role in the marine food web, both as a predator and prey for larger marine species.