Thanks for the reply. I was pretty sure but wanted a second opinion since I had not stocked them. There's a slim chance they came from a nearby pond but I hadn't stocked them so I was a little frustrated. The good news is that these things will bite at almost anything so you rarely reel in without catching something! It's only 1/4acre so i'm wondering if transplanting 1 or 2 LMB would slow them down enough? There are so many fry I'm sure it will be overpopulated before too long if left unchecked.