From Nymphing, by Gary Borger . . .

"In fly fishing, a nymph is loosely defined as any subaquatic, invertebrate food organism of the trout. ... Insects come first to mind, ... the smaller crustaceans ... leeches, small aquatic worms, and snails also fall into this category. Artificial nymphs, as opposed to classic wet flies, are expressly designed to imitate one or more of these subaquatic forms."

Cheers!

[This message has been edited by uptroutfishr (edited 14 February 2005).]