Twenty minutes west of the small town of Middelsburg in the south of the Netherlands is the village of Kats.

There is little outside to indicate that this unremarkable village -- with its windmills, marina and post office -- is home to millions of yellowtail kingfish, a staple of conveyor belt sushi restaurants worldwide.

Also known as hiramasa, yellowtail is found predominantly in the Pacific and has become increasingly popular as an alternative to endangered species such as bluefin tuna and swordfish.