
In terms of fly fishing, a nymph is one of the four main categories of fly lures. Generally it resembles an insect or stage of insect living underwater. Leeches, mayfly nymphs, caddis fly larva, and diptera can all be imitated by nymphs.
Normally a nymph is tied on a heavier hook, sometimes with an added weight in the body to keep it sunk during presentation.
Nymphs can be fished successfully upstream or down. A large percentage of what fish eat is found living underwater and imitated by nymphs.
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