Trout rising in the evening have reputation for being notoriously difficult to tempt. In truth, this is only partly true, especially during the early stages of a hatch, which may begin before sunlight is off the water. Due to the brightness now, fish are often nervous and respond better to smaller flies, even when the naturals they’re feeding on might be larger. If you experience refusals, or see fish simply nosing the fly, rather than knot on an entirely different dressing, think of merely dropping down in fly size, perhaps from something like a size 16 to a size 18, or even 20.
Whilst contradicting the above there are times when stepping up in fly size can be beneficial come evening time. Lots of natural insects littering the water often mean your imitation gets lost in the crowd. An oversized fly stands out, hopefully making it more attractive. Equally, given a breezy surface, smaller flies are easily lost in the commotion of a ruffled surface. Again, think about selecting a larger imitation. Perhaps more poignant though is increasing the size of your fly as the darkness grows. A sinking sun usually sees trout lose some of their inhibitions and become bolder in their behaviour. Now, a larger fly cast out into the gloaming can be devastating.
Trout fishing during dusk can be a painful experience as your most important sense, your eyes, are partly taken out of the equation. Yet, for those willing to embrace the darkness, the rewards can be significant. The chance of connecting with a larger fish increases, as bigger trout often feel safer under the cover of low light. Fish are generally less wary, moving more freely and feeding with confidence. And perhaps just as valuable — the water is quieter, with fewer anglers around, allowing you to fully immerse yourself in the experience. In the end, success at dusk comes down to trust: trusting your instincts, your water reading, and your flies. When vision fades, intuition takes over — and that’s often when the magic happens.