most of the "no fishing from boats" that happens up here is due to non-boaters hating the fact that they are being out fished by those in boats. They usually get the placed closed after some one "catches too many" compared to the bankies. It almost never has anything to due with fish management but all to due with jealously. Happened on the Gold river this way,and on the Thompson river this way when one boat caught what was deemed too many by the regular anglers.