Like minnows, crayfish are an extremely important food source for large trout. Many feed on nothing else for weeks at a time. Anglers are perpetually on the search for the perfect crayfish imitation, and so far no fly tyer outside the realm of rumor and legend has devised one.
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Emergence: The transformation of a nymph or pupa into the adult winged stage of an insect. The term may refer to the emergence of an individual, or the daily or yearly event in which all individuals of a species emerge.
Nymph: The juvenile, underwater stages of mayflies, stoneflies, dragonflies, and damselflies and other aquatic insects whose juvenile stages are covered by hard exoskeletons. The word can also refer to the fishing flies which imitate these creatures, in which case it is used as a blanket term for flies imitating any underwater stage of an invertebrate (except for crayfish and leeches).