Honest question: How many boats are actually doing this? It might just be one or two, but they are on the water 300+ days per year, and "bombing" for 12 hours a day. I think just one or two boats could do a huge amount of damage. Also, it seems pretty easy to fix this problem: Offer a reasonably large financial reward for information that leads to the arrest/conviction of captains of bomber boats. Probably the workers on those boats are paid very low wages. If you offer the equivalent of one year of earnings for the tip, you can probably catch the captains very quickly. Even better: Pass a law to take possession of the boat from these captains/owners. Then the workers can buy/rent the boat with the reward money and get back to work.