Fly Fishing in Connecticut. Kevin Murphy

have “lateral lines” down both sides of their bodies that allow them to sense barometric pressure, and alert them to approaching fish, anglers, and other possible threats. When a storm front comes in, barometric pressure falls, and these lateral lines tell the trout to start feeding. If you can arrange it, try to go fishing when the barometric pressure is dropping.

      These same lateral lines alert the trout when you make a lot of noise walking and splashing in a stream, even when you are trying to be quiet. The speed of sound is more than four times faster in clear water than in air. Therefore, you might say trout are infinitely better equipped to sense you than the other way around. By working your way upstream as you fish, trout are less likely to intuit your approach.