RE: The critically endangered Ganges shark (Glyphis gangeticus) has been seen for the first time in over a decade, but sadly it was found dead in a Mumbai fish market

[valth]

There are a few species of sharks that can live entirely in freshwater, as well as the bull shark who can freely swim up estuaries and into freshwater lakes if it wants to. I have not found any reports of attacks from the Ganges shark, but that does not necessarily mean that it is not dangerous, it could just be that it's too rare to meet up with people.