Damselfly nymphs are among the most effective invertebrate predators in freshwater. You have to see one in motion to get a feel for their slow, deliberate style of stalking.
I have diddled and fiddled to produce decent damsel nymphs for some time now and it is tough to come with up something good either impressionistic or realistic. The one thought, when I watch them move in their environment,is always that they are very sparse predators. So whatever I tie, and it always seems to be an improvement over previous productions, is something slim. Good thing fish often are not too fussy.
Greetings, A.K.
Calopteryx
These are beautiful as adults. Wherever you get these, you should go back when they are emerging. Alternatively, keep them in your aquarium until they emerge. They're easy enough to keep...except when you have Aeshna with them...