How many did you stock in your 15 ac lake? What size? Don't you have a healthy population of LMB? Could have been an expensive snack...you should consider getting your 2 ac pond cleaned up and use it as a grow out pond. Could get 2" HSB to 18" in 2 years with good water and lots of AM.
They were this big.
I suppose the lmb could have gotten some of them, but don't you think some would have survived?
The trouble with my 2 acre pond is it is now full of bullheads.
