Parrot feather's terminal-growth usually extends several inches above the water's surface, as also occurs with variable-leaf milfoil - though to a lesser degree. Eurasian watermilfoil, however, remains completely submerged.
All three are in the same genus, but have distinctly different physical characteristics.
After closer inspection, the second photo that was posted as fanwort is actually Eurasian watermilfoil - an exotic/invasive, and virtually impossible to control with non-chemical methods. As a cold-hardy specie, it is able to survive - if not thrive beneath ice.
Regarding photo text-removal: text placed over a random-pattern or solid-texture background makes the job relatively easy. Text placed over a detailed or multi-textured background is very difficult to edit or remove.
I.E. removing the text in the above photos would leave very noticable smudges in the modified images.
On a related subject: one should always scrutinize digital photos that seem abnormal - especially of tropy fish or game animals...
