Water Gardening: Can anyone ID this ?, 1 by Dulcigarden

Dulcigarden wrote:
Today I came home and went to feed the fish. And this is what I found stuck to the edge of the pond, looks like a cacoon of some sort? I know that it looks like something I've seen in those sci-fi movies only in a much smaller scale :0.

Please let me know if you recognize it, would like to know if I should let it be or if it could be harmful to the fish. It has been raining a lot all day here too.

Thank you so much in advance.
~Dulci