An impossible ban?

While some  environmentally conscious countries are proposing to ban the international bluefin tuna trade, in Japan business keeps going. The first tuna auction this year  fetched a price of 1.55 million Yen ( around 11 600 euros) for a 150 kg fish. For an obvious reason,Japan is opposing the ban proposition. It  would put an entire Japanese tuna fishing industry to the end. Of course, the outcome won't be better when  bluefin tuna is extinct from the oceans, but i do not imagine how all those traditional sushiyas would change their menus and stop going to Tsukiji every morning to buy this expensive fish...Just some food for thought...