In response to Bob's post - it sounds like Bob is looking at Genetics management more.
So after reading all these posts and keeping Bob's post in mind. Could this be done?
You mange for genetics and create a LMB that can't reproduce - then fill your pond/large with them and you then do put and take with your newly created LMB that can't reproduce.
Just stock only females from your purebred LMB breed. Better yet, stock females from the first generation of a cross between two genetically distinct monster LMB bloodlines for hybrid vigor and large size.
