Here is a technique someone else wrote on a past thread...
I don't know about fishing for them in that area. I target white perch in the summer and fall around shoreline structure and edges of grassbeds in the MD Ches Bay tribs on the western shore like the Severn and Patuxent. I fish ultra light spinning gear with "beetlespin" type safety pin spinnerbaits with 1/16 oz jigheads and 2 inch twister tails. Last year I started using white and chart. berkley gulb twister tails with great results--more 12 inch perch for me last year than ever before. Before I started using gulps I usually tipped the hook with a bit of perch belly or a grass shrimp or sometimes small minnows or bits of bloodworm--a little bit of flavor or scent is very helpul.
I get a lot of 10 to 12 inch perch and loads of them in the 8-10 inch range. Best conditions are often at higher tidal levels and/or lower light levels--they move in very shallow in low light. We fish mostly around docks, downed trees, and rip rap shorelines, as well as the edges of grassbeds if they are present where we are fishing.
Catching white perch in tributary rivers during the summer months is one of the surest bets in fishing, at least in the areas I fish. When after white perch we also sometimes catch yellow perch, stripers and croakers as well as pickerel, catfish, bass and some sufish in certain areas.