I have caught 10 Salmon over the years with the chip in the head, (Caudal fin clipped). When you turn the head into the Game and Fish they send you a letter telling what year the fish was released, where it was released, and what size it was. last spring and summer my neighbor and I caught 4 Walleyes just south of the tailrace past the 2nd Coal vein. All were from SD Game and Fish and one of them was a $100 tag. All with the tag in the lower jaw.