If you figure someone's poaching, especially large quantities like that, call fisheries and report them. Write down their vehicle licence number and give the details on the Observe, Record, Report phone line. I'm not saying it will do any good, as I have little confidence in the DFO doing anything. At least you will feel you did something to help the resource (even if enforcement is lacking).
The Observe, Record, Report phone number is: 1-800-465-4336