Tuna is a saltwater fish belonging to the tribe Thunnini, which is a subgrouping of the Scombridae family, commonly known as mackerel. This group comprises 15 different species distributed across five distinct genera.
The size of these fish varies significantly depending on the species, ranging from the small bullet tuna to the large Atlantic bluefin tuna. The Atlantic bluefin tuna can reach an average length of 2 meters (6.6 feet) and is estimated to live for up to 50 years.