That's why carrying an updated copy of the regulation book as well as printed copies of the latest fishery notices don't only help you to follow the rules, but also correct the fishery officers when they mistakenly charge you with a violation. You can always fight it at court, but that's a waste of time, energy and money. Many fisheries officers are new recruits from other provinces, therefore there is a learning curve at times.
A few years ago, the pink salmon opening on the Fraser River was extended so a couple of members on the forum were fishing for them, only to be stopped by a fishery officers who were ready to write them tickets. They asked the fishery officers to check with the office for the update. After being corrected, the officer returned their licenses and commented that they were "lucky" as if the anglers intend to be out poaching.
Another case last year, an officer wrote a ticket to an angler who had some northern pikeminnows in the bucket, because he thought they were eulachons, which are closed for retention. Because of the language barrier, the angler was unable to convince the office that they were not eulachons.