'mmmm I'm authorised to catch 20 tons of fish. I "unintentionally" catch an extra 50 tons of unauthorised fish that are supposed to be left to breed to restock the dwindling supplies. I'm allowed to sell them and make a fat profit from destroying breeding stock. Yep, that certainly discourages me from "unintentionally" destroying breeding stocks. Perhaps I'll go out again tomorrow and unintentionally catch some more. Then I can complain that the fish stocks are going down so I should be allowed to take more of them.