I'd be fine with the DFO just seizing the boat and everything on board, and no further punishment, to be honest.
"Hey, you're engaged in illegal commercial fishing. We're taking your boat and everything on it, so prepare yourself for a bit of a shift in priorities."
"Why, what are we supposed to do now?"
"Depends...are you a good swimmer? Because your life jackets also belong to us. Anyway, good luck. Now get off our boat."