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I will match my line to the body of water. I use 6# or 8# mono in the big bodies of water where fish average 2+ pounds I could could hook into a pig. Smaller lakes where I know I am very unlikely to see anything over a couple pounds I will stick to 2# or 4#.Other things to consider:Temperature; If it's very cold out I lean toward heavier line. I hate snapping frozen line. Vice versa, if I am in the warm shanty, I go lighter.Patience; If you are the type of fisherman that tends to crank on the fish and get it up the hole quickly, like I am, go with heavier line. If you are the type to play the fish longer, you can probably go lighter if you want. Bait/Lure. If you are fishing a small light jig, a lighter line will work better. A super light jig on heavy line, the line may not want to un coil well. This will be my fifth year ice fishing. I have progressively gone to heavier line. I have just lost too many fish to line snapping, sometimes from cold, or my over zealous landing attempts, or a combination of both. I haven't found any drop off in numbers of fish by going to 6# or 8# and have been able to land fish that i otherwise would not have.