How is law enforcement going to be able to ticket someone in shallow water without impacting the seagrass themselves?
In some cases they can wait until an offender has passed out of the area before stopping them. In other cases they may have to enter the area themselves, just as a trooper has to exceed the speed limit in order to catch a speeder. If a warden does have to damage some seagrass in order to enforce this law, remember that they are only doing so in order to help reduce future damage.