I have a 6 acre pond that is about 5 1/2 years old.This year we are catching alot of crappie in the 6-10 inch size,last year we caught maybe 10 all year.To date this year we have caught about 35.The problem is we had to fill this pond with a water well due to it has a levee around all four sides,so the only water it gets is threw the well.We live on the property and have been managing this pond for largemouth and bream fishing.Could someone please tell me how these fish got in my pond.