Head to the Desert sea from the village. In the lower left (southwest) of the Desert is a small pier with a boat. Stand at the edge of the rocks to fish. Choose a lure as your bait. Rather than wait for the lure to dip deep into the sand, look for a quick dip while the lure is floating. You can feel a strong vibration if you're using a controller. Hook the fish and start reeling once this occurs.