Hey everyone, I need some feedback.

My walk around the pond yielded some unexpected results. I found four fish dead.

Here's what's strange:
1.) The dead fish were all carp. Stranger still, we didn't stock any carp.
2.) The other fish in the pond looked healthy; eating fish food fine and bluegill bedding already in my gravel areas!
3.) One fish had a large hole in the side and the others were dead but not eaten or even chewed on.

I have my theory/suspicions but before I say what I think is the cause I'd like to hear from some of you that have experienced something like this before.

Ephesians 2:10