Dave,
I read a study on the Internet a while back where they took wild yellow perch and were able to get them on feed, after I believe it was, 8 days of starving them in a tank. Unfortunately I don' remember which one it was and where it is.
All I remember is it was one of the state DNRs.
That said, as of today I am going to concentrate the yellow perch in my production pond in the last 10 feet or so of the pond with a seine. I'm not convinced I have as many this year that have taken to the feed, and albeit late in the year, I'm hoping I can get more of them on the feed. If anything I can at least get an idea of what is in the pond as I just don't believe I have the numbers I had last year.
Although I was excited to see significantly larger fish feeding on night in deeper water under the light one night, I'm seeing mostly under size perch higher in the water column under the light. I'm not convinced those fish are feeding on the feed, but rather going after zooplankton. They are also feeding on surface insects quite aggressively. They are not much bigger than the average bait minnow in length and relative weight, but they should be larger.
If you're interested I can take pics and keep you posted on progress. I would have done this sooner but was dealing with macrophyte issues and tennis elbow. Now I've pretty much recovered from the tennis elbow and have raked all the macrophytes out of the pond. I dropped the pond about a foot last night to make sure the seine had plenty of extra depth to be most effective.