Section 55. Non-Obstruction to Navigation. - Nothing in the foregoing sections shall be construed as permitting the lessee, licensee, or permittee to undertake any construction which will obstruct the free navigation in any stream, river, lake, or bay flowing through or adjoining the fish pens, fish cages, fish traps and fishponds, or impede the flow of the tide to and from the area. Any construction made in violation hereof shall be removed upon the order of the Department in coordination with the other government agencies concerned at the expense of the lessee, licensee, or occupants thereof, whenever applicable. The Department shall within thirty (30) days after the effectivity of this Code formulate and implement rules and regulations for the immediate dismantling of existing obstruction to navigation.