Useful flies & fly tying
 

Chironomid (midge pupa) ... a basic fly for lake flyfishing, good for all trout species and chub, carp, bream and perch as well.

SLF streamer ... an useful fly for any fish predator like pike, perch, pikeperch, chub and bigger salmonids or even some sea fish.
Extended body mayfly ... a very interesting dry fly for tying and fishing as well. Good for trout and a season from may to august.
CDC caddis fly ... one of the best dry flies for really big trout, especialy for an evening fishing and also for a lake use by the surface activity.