Yellow Perch can be undetected for a long time.
I had my pond for several years before I ever even knew there were Yellow Perch in there.
Here in PA, I you have a private pond, only the direct family members who own the pond can fish without a license. For my pond, that would be me, my wife, my brother, and his wife. Nobody else can fish without a license. Not sure how my kids would play into that once of licensing age.
Generally, the Game Officers here stay off of private property; they have enough to deal with in public lands.
