Over the past century, the tuna canning industry has been dominated by a few big companies, some of them having changed of ownership or merged: these oligopolistic firms are the “big three” in the USA, Van Camp, Star Kist, and Bumble Bee, the French Saupiquet, the Italian Trinity Alimentari and the Spanish Calvo in Europe, and, a bit later, the Thailandese groups Thai Union and Sea Value. Speci...