The warm mouth would be for eating and catching. I am hoping to stock a few different species that will naturally provide fingerlings. With my past indoor warm water projects the hatchery/ nursery part was very costly, frustrating, unforgiving,etc. I really enjoyed it, and will probably do it again someday but for now want Mother Nature to do that part for me. I envision either trapping or netting the pond in the spring and maybe fall to provide fingerlings and cull.