I never let that stuff slide, say something to them, get a pic of them and their plates when they go to their vehicle and give the MNR the information and follow up with them to make sure they are doing something about it. Give them a witness statement with your complaint ask for an incident number and follow up with them. The MNR can't be everywhere and if we as sportsmen and women are not willing to get involved and be proactive in the protection of the species and adhearance of rules then we can only piss and moan. Just phoning the mnr and telling them someone at the creek was snagging isn't really going to do much, they will need more information. Snagging on purpose really bothers me and my usual fishing partner the trunk monkey really gets pissed. Picture, plates, phone the MNR and provde a witness statement, yes alot of people will say not my job and don't want to get involved. I understand and thats your choice, sometimes these things can esculate and we are not all geared towards confrontation, but you can get a pic of a plate or a person without them noticing, if you have a working phone lol. Or just send your trunk monkey over to talk to them.