Could ports regulate what fuel the ship is carrying, even if it's not burning that fuel while in port? For instance, if a cruise ship is burning clean fuel bec

Could ports regulate what fuel the ship is carrying, even if it's not burning that fuel while in port? For instance, if a cruise ship is burning clean fuel because it's near port, but is carrying a great deal of dirty fuel for use when it gets back into international waters, could the port fine the operators of that ship for merely possessing the dirty fuel?