Some Canadian Coast Guard vessels have an officer that has special training to enforce the Fisheries Act, some vessels have fisheries officers aboard to enforce the FA. many don't have either so in that case they could enforce boating safety regulations. Theft is not part of the FA but as mentioned Gear Disputes are. I would guess that if a Fisheries officer caught someone stealing gear red handed they would collect evidence and pass it on to Police ; the same as they do with impaired boaters. In my experience Fisheries officers are not going to be actively enforcing gear theft......... but you could get lucky and get a super keener officer to do something.