Greg - As you know your pondowner has the correct conditions for probably all northern strains of y. perch. A lot of what I said above does not apply to him since he has unique conditions in the south.
I assume you want fingerlings. Since y.perch tolerate low DO conditions they ship well; esp during cool weather. Finding a hatchery to ship fish after Sep 11 01 is sometimes hard. UPS sometimes does not accept live fish anymore. You may have to search around to find one who can ship. Air freight is always an option; several boxes can be shiped per 100 weight & one flat fee. I do not know about southern perch raisers. They may be scarse probably because of the aforementioned temperature reasons.
Try in this order:
Fenders, Jones, Freshwater Farms, Paradise, North Star, Zetts.
1. Fenders Fish Hatchery. I like their perch; southern OH acclimated for many yrs. in shallow ponds from Lk Erie stock. Used to ship various species all over US for Univ. research; now??? Their perch do well in small ponds & w/ good food sources up to 14" are common; occassional 15"er. Rare reports of 16"-17" but have not seen any proof of these monsters. . 740-622-0681
www.thelinkto.com/fenderfish/ 2. Freshwater Farms - Aquaculture facility, central OH. Greats Lakes Stock. Shipping?? 937-652-3701
www.fwfarms.com 3. Paradise Fish Farm NE OH facility. Brood stock? I think they get eggs&fish from several sources. 330-549-2990.
4. Jones Fish Hatchery SW OH farm and possibly a KY farm. Not familiar w/ growth rates of their fish. May grow YOY perch from broodstock in KY. Shipping?? 513-561-2615
www.jonesfish.com 5. North Star Fish Hatchery. Iowa. Can ship. Not sure of their brood stock. I have heard midwest US or Iowa strain does not get a big as Grt. Lk. strain. Truth?? 641-492-6159.
6. Zetts Fish Farm PA do ship air freight and ?UPS? Expect smallest size of listed range. "Ken Holyoak of the north"; brags of special strain of lg. perch. Seen some of his fish and they do get to 13+". 814-345-5357. Not real friendly people to average pondowner.
I have names of other hatcheries in MI & WI if needed.