I am doing a science project on what is affecting the difference between two local creeks' fish populations.

I noticed yesterday that there was a watersnake in the creek with a very small population of fish. I came to the conclusion that the snake was a Diamondback water snake. From what I have researched, it is said to feed on fish, amphibians, and other aquatic life. Can this snake be enough to cause a noticable decrease in the sunfish and bass population in this creek.

Not sure but we have tons of them around here. There commonly mistaken for cotton mouths. We see them eating small catfish up to 10-12 inches fairly often.