it looks to me like the photographs #1 #2 and #3 show two species, Potamogeton crispus and Myriophyllum verrucosum; in the lead photo (#1) Myriophyllum verrucosum is most evident, with some leaves of Potamogeton crispus in behind.
Thanks Jane Agree, the prominent inflorescences are the Myriophyllum verrucosum, and the curly leaves are Potamogeton crispus. Hi Sandra Can you please edit the sighting and put in a separate one for the Myriophyllum verrucosum. If you do a crop and close-up of the Myriophyllum verrucosum it will be more obvious.