As BGkiller suggests, try spraying the surface film with diluted Cutrine-Plus liquid. Read label for proper mix rate with water. I did not see a close enough picture to recognize the pondweeds. The emgerged weeds along the shore might not be aquatic are are terrestrial plants that were inundated with water ??? Again the picture of them was not adequate to identify the weed species.

aka Pond Doctor & Dr. Perca Read Pond Boss Magazine -
America's Journal of Pond Management