As every year, the tuna boats have set out for a month at sea to fish for red tuna. Each boat is obligated to take on board an observer from the ICCAT and to declare in advance the cages where the tuna will be kept at sea and fattened before being sold. On arrival the tuna is filmed as it is transferred from one cage to another in order to measure the fish and estimate the tonnage. Once fattened, the fish is then prepared and packaged on a freezer ship before it is distributed on the Japanese market, its final destination. Red tuna is much appreciated by the Japanese. Ten years ago this was an endangered species but thanks to conservation methods which will be continued until 2022, stocks are replenishing. Indeed, not only fishing industry indices and scientific aerial monitoring but also professional fishermen confirm this trend. In the same way, estimates seem also to confirm a clear increase in biomass. Proof that it is possible to imagine a different ending to a predicted extinction.