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When does it occur?
When the water temps are around 45 degrees
Buster pretty much hit the nail on the head. Never a consistent date for the spawn. Happens with change in water temp. Also, might add that it occurs at different times on different bodies of water. The river is pretty consistent with temp. but bigger bodies usually takes place around June.
On the plains of North Dakota, for all the world to see. Stands an old abandoned outhouse and they called it UND.
between 42-50, a long time from now!
Try calling Game and Fish. They have dates prescheduled annually for their teams to collect eggs for the hatchery. I know every year they're set up in Parshall and White Earth bays. Well, White Earth only if they don't get enough out of Parshall. I'm sure the Sakakawea biologist is the authority.
The spawn is not just dependent on water temperature but also upon photoperiod. All walleyes in a body of water don't spawn at the same time either, but rather over a period of time. Some walleyes will be done spawning while some will be just starting and some will not spawn at all.