in general, tailwaters host large populations of insects year round and generally have great hatches do to the fertile waters. Fish can get big fast on a good tailwater. most tailwaters will have a population of mysis shrimp or some similar scud type thing. usually they are small, like a sz 18 or 20. gebnerally smaller pattenrs are more successful on tailwaters, especially heavily fished tailwaters.
this tailwater is far away in Italy. maybe if you could find an italian forum or do a simple google search for the place, you may get better results.
the bottom line is that trout are always trout and eat trouty bugs. the same flies catch fish on every piece of water i have ever fished. have some dark and light nymphs. some heavy ome light. some sparse some fat and buggy. have some big and small dries. light and dark, some parachutes some traditional.
every single tailwater i have every fished was bvetter fished with small nymphs or emergers. during hatches, emergers will almost always outfish a dry on any tailwater anywhere in the world. my favorites are deer hair emergers and klinkhammer variations but everyone has their own favorites.
as your son (and you) competes and fishes different waters in different places, you will find the same flies will work on every trout stream. all of them have caddis and mayflies, stonelfies and terrestrials. I fish the same exact flies here on Cape Streams as I did on the Henrys Fork in Idaho, the Bighorn in Montana, the Taylor River in Colorado, every river in New Zealand, and all of my home streams and spring creeks in California and Wyoming. the way you fish these flies is what seperates good anglers form the rest.
the thing is to find your own style, gain confidence, and attempt to attain perfection. the flies and techniques are the easy part.
Oh, and I'd rekon those fish will eat a streamer, they all do, especially the big ones
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