To be clear, the article did not say Dave Micus intentionally fished for bull trout. What it did say is that his guide/friend did, which I believe is worse as a guide should (and probably did) know better.
Gandalf: A prerequisite element to finding a person guilty of many crimes is an intentional act. Come on, when a person is looking at a bull trout and casting a double bunny to it, regardles of what other fish exist in the river, he is intentionally fishing for bull trout.