This gives them a distinct predatory advantage over most baitfish species, because walleyes can see much better than their prey under low-light conditions. A sudden decrease in light level triggers walleyes to feed. That explains why they usually bite best just as the sun is sinking below the horizon or when the dark clouds preceding a thunderstorm begin to roll in. In dark, discolored water where walleyes cannot feed by sight, they rely heavily on their lateral line to pick up minute vibrations in the water. Scent is much less important than these vibrations when it comes to finding food.
Walleyes are cool-water fish.
They are most active at a water temperature of 69 degrees. Walleyes begin to spawn in early spring, usually when the water temperature reaches 46 to 48 degrees. They feed heavily just before spawning, but once it's in full swing, feeding grinds to a halt. After spawning has been completed, the females do not feed for 10 to 14 days. The males, however, start to feed much sooner.