I saw quite a few of them two weeks ago but they were cruising about 5-7 feet down in 9 fow. I was lucky catching a few with my flasher, one was way up at 4 feet deep. With the flasher it's pretty tough as there would be a bunch of them go by in 5 minutes and then nothing for 15-45 minutes. Normally it gets better at dusk/night when they come into 3-5 fow but almost everyone got skunked that night and I didn't see many on the flasher. It was so murky that I had whites almost bumping into the camera but they never seem to care about cameras during the spawn anyways.
If you're jigging constantly, its a waste of effort when there's not a fish around and the clarity is only about 4 feet so nothing further than the flasher sonar would see it anyways. Flashers are awesome
Where were you fishing Pike?