Also about your walleye question, it is not very likely that you will get enough recruitment from the walleye. Although there have been cases where they have retained substantial recruitment but most of the time its not the case. Also having walleye control crappie number seems like a bad idea. Walleye probably won't control the crappie and walleye might have a hard time time consuming the saucer shaped crappie unlike the torpedo shaped YP. Most likely I could see most of the walleye being stunted and you having a ton of stunted crappie. if you stock the walleye at low rates you will have probably of few good sized walleye and still a bunch of stunted crappie. I'll let some other people chime on as well.