We have those nasties ....
living around most of our canals here in South Florida.
One time when I was fishing for bait with tiny hooks in a canal a block away from us the only thing I caught was, I thought, an eel. It had swallowed my hook and was hanging at the end of my line.
I dropped it in a bucket, cut the line, and carried the bucket home.
Fortunately our next door neighbor came over to see what it was. He jumped back "Joyce! That's a Water Mocassin, that aint no eel!
He killed it with a machete.
As for me, I've never gone near the canals down here since. If they don't have Water Mocassins they're likely to have Aligators or red and yellow kill a fellow Coral snakes.