My restaurant, called Miya's Sushi, is just a few miles from Long Island Sound in New Haven, Conn. We have made it our goal to return our cuisine to the roots of sushi, meaning simply to use what we have available where we live. Too often what we find now are invasive species—unwanted plants and animals humans have introduced to ecosystems. Nationwide, invasive species such as the wild boar and Asian carp are destroying farms and fisheries, causing economic damage that has been estimated at $120 billion a year.