fisho-24, that hole is 6" (15cm) diameter, a bit under 19" (47cm) circumference. The pike's circumference only around 13" (32cm), so it comes easily up, if you just manage to make it in the "tube". Oh, and if the fish is bigger than the hole, you just drill 2 more holes around the initial one and make one big hole.
Ice fishing is very close to meditation. I just find the peace when ice fishing.
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tammy_lilbit, we don't actually have any limit on pikes (no size or amount), it's so common fish and tbh so little fished. But as responsible fishers, we don't take anymore than we can eat ourselves. The 2 pikes, that got away, got away before this one we got up. They were actually just bites and snap, the line was cut. Sharp teeth and we didn't take our wire traces with us, just used .45mm (.017 inch?) fluorocarbon, which obviosly wasn't enough for pikes' teeth. After this one we called it a day.
We don't have walleyes, but on zander (or more commonly known as pike-perch), we have legal minimum length of 40cm (bit under 16"), but no amount limit in most places. I think we should have. We keep the minimum limit ourselves as 45cm (bit under 17") and take at most 3 fishes, usually 1 or 2 is enough. By means of ice fishing i've never caught any zanders (yet!) though