Thank you both very much for the info. Its slender and super fast.
When I get to within 15 feet of the pond it soars out like a bullet and flys through the fence into the field by the farm.
I know its not an Indigo not a water snake . Narrowed it down to large black ringneck with no ring (if thats possible) or ofcourse some type black native slender snake.

I have never seen it eat fish but considering I have seen it by the pond or on the edge (only on hottest days) I imagine its eating them as several local canals thus would get his/her water there.

I have zillion platys now and mosquito fish so it can take whatever it wants . I have gone out in yard with cell phone to take pic of it when I go feed the fish but see it once in blue moon than its greased lightning.

Thanks