I will certainly left the place if I were you, seeing so many snake when fishing, as I am a little bit scare of them.
water moccasin
is this the one the curl up their body, and then drift away with the water flow?
I have seen some funny and scary video that some dumb teenage was trying to scoop the little thing from the water while it is drfiteing.
I'm not sure if that's what they are but they are a venomous water snake, we just don't usually have them around here.