I kept a log of each fishing trip for over 10 years. At the time, I was fishing 200+ days a year. Walleye only !! The results I got were that on a full moon +and - 3 days, I caught more fish but smaller on average. On new moon + and - 3 days, I caught fewer but larger walleye. This diary was kept 12 months of the year so it includes ice fishing as well as open water.The very best time to fish though ?whenever you can !!!