Bluefin tuna without head and tail. The Atlantic bluefin tuna is the largest tuna in the world. It can reach a length of 3.5 meters with a maximum weight of up to 700 kg. The Atlantic bluefin tuna is called ‘Hon Maguro’ in Japanese and is not an endangered species. The bluefin tuna without a head that we describe here is ‘grown’, better to say, a fattened one. The fatted Bluefin tuna has a high fat content and is fatter and more intense than the original wild variety. Bluefin tuna is a fast growing fish as it grows up under ideal conditions, body weight can increase by 60% over a period of one year. Bluefin tuna is available without head and tail and without guts. The viscera are removed because they spoil the first and can seriously damage the fish meat. Bluefin tuna must have a mandatory ICCAT registration, without this documentation the tuna is illegal. Some tuna fattening plants go one step further and add a QR code system for product traceability. This makes the process fully visible. Date of catch, weight, fat percentage and even a microbiological report can be found through this system.