Currently 80% of hamachi exports go to the United States. The rest are exported to Hong Kong, China, Canada, and Thailand. In Europe, England, Belgium, and Holland have most imports from Japan. So, there are many countries you can get Japanese-raised hamachi.
Since fatty fish is preferred in Europe recently, such as o-toro (the fattiest portion of tuna) or gindara saikyo-yaki (miso-marinated and grilled black cod), we can expect that the demand for hamachi grows in the future. Yet compared to North America where hamachi is distributed widely, Europe still has the issue of transportation costs and only some high-end restaurants serve the fish.