You'll have to head towards O'Neill for perch. Crappie by David City? I couldn't say for fish over 10. Czechland has had a good population for a while, but I would head to church and start kissing up to the local farmers/farm "widders" and ask to hit their ponds, while offering to clean a mess for their freezer. I wonder if there are any Open Fields and Waters ponds up that way? (not so subtle hint).