Jumping Fish

So, a guy was fishing and had a bucket of fish. The warden came by and saw how many he had, and told the man he was going to fine him for having so many fish! The man said, “oh, these are my fish, I dump them out and shortly they jump back in the bucket.” The warden said, “This I gotta see… show me and I won’t give you a fine”, so the man dumped out the fish into the river. After a while the warden asked, “so… where’s the fish?” The man looked blankly at the warden and said, “What fish?”