Sweetfish, called “ayu” in Japan, are born in rivers and grow up in the ocean. They are freshwater fish that come back to their native rivers again. Because sweetfish have a good flavor, they are also referred to as “flavor fish.” It is possible to angle for natural sweetfish by decoy in Kochi Prefecture. Angling by decoy is a fishing method in which hooked active sweetfish are released into the river in place of lures in an attempt to attract other sweetfish and catch them. It is a luxury leisure activity that will give you the treat of top-quality sweetfish.