Most fly anglers know that mayflies have two adult stages: duns and spinners. Entomologists call them subimagos and imagos. See the main Ephemeroptera page for the basics of these two stages. Much of angling literature and this website consists of tips about matching one stage or the other for the various species.

What is a DUN in fly fishing? A fly fishing DUN is the stage of the mayfly between a nymph and adult mayfly. The technical term is the SUBIMAGIO stage. This is a vulnerable phase for the mayfly since the wings are formed, but have a dull opaque color. Often this stage results in trout actively feeding from the water surface.

The subimago, or dun, [6] often has partially cloudy wings fringed with minute hairs known as microtrichia; its eyes, legs and genitalia are not fully developed. Females of some mayflies (subfamily Palingeniinae) do not moult from a subimago state into an adult stage and are sexually mature while appearing like a subimago with microtrichia on ...

2025年1月28日 · It became clear that the three stages of a mayfly’s development—nymph, dun, and spinner—were some of the most important basic fundamentals in fly fishing. Mayflies are members of the Ephemeroptera insect order, which literally means “short-lived winged insect.” Mayflies undergo what is referred to as incomplete metamorphosis, meaning ...

2022年10月20日 · A fly fishing DUN is the stage of the mayfly between a nymph and adult mayfly. The technical term is the SUBIMAGIO stage. This is a vulnerable phase for the mayfly since the wings are formed, but have a dull opaque color. Often this stage results in trout actively feeding from the water surface.

2024年7月15日 · With those defining characteristics in mind, there are a few key types of dry mayfly patterns you will need you your fly box: 1. the Emerging Mayfly Dun transitional from nymph to adult at the surface of the water; 2. The fully emerged Live Adult Dun and Spinners on top of the water; and 3.

Fly Fishing Mayfly Nymph Adult Dun Spinner - Best Mayfly Nymph Fly Patterns, Expert Fly Fishing Techniques & Entomology for BC's Trophy Trout Lakes!

2021年5月5日 · When an emerging mayfly ends up crippled on the surface, its struggling attempt at flight is like ringing a dinner bell for the fish. Some duns emerge from the nymphal shuck with damaged wings and unable to fly.

2025年1月28日 · The Craig Mathews sparkle dun is a no hackle pattern that can be tied in just about any size and colour to match the hatch. The sparkling trailing shuck makes this pattern a stillborn or cripple mayfly, making it easy pickings for feeding trout.

2015年10月14日 · When the exoskeleton breaks open and the adult mayfly gets released – the nymph emerges into an adult – a dun (subimago) that has dull-colored wings and breathes air. They float on the water surface and wait for their wings to fill with fluid and their veins to harden (as opposed to common presumption that they are drying their wings).