See the faint horizontal line in the middle of the body? That's it! / Photo by Jasper Taback If you’ve ever spooked a trout and wondered how the hell it knew you were there, odds are it felt you.

A fly angler hooked into a trout amongst red salmon. / photo by Ken Baldwin Spring is close, so it's time to get your gear together and make sure it's all in working shape. Waiting until you're on the ...