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The bushy plant in the first pic is likely a form of Cabomba, but I can't tell for sure without a closer view. Is there some way for you to get some shots with more zoom?
The first is C. carolina.
The second is really hard to tell though I don't think it is a hygro species. More likely a Rotala (possibly rotundifolia or macrandra).
The last pic (needle leaf plant) looks like hornwort.