I had the pleasure and privilege to be invited for a one day fishing adventure on the river Sinn in the German region of Rhön. On that chilly but sunny day and my main target was the lady of the stream - the grayling. Sinn is a beautiful river which flows across fields, meadows and forests and which hosts an impressive population of grayling, brown trout as well as rainbow trout (apparently released years ago by American soldiers from a US Army base nearby). I started off around 9 am and quickly found a spot where timid rises could be observed among the brown-red autumn leaves floating on the surface. It then took me around 1h to find out which exact fly pattern was on the menu. It wasn't a klinkhammer, it wasn't a midge, it wasn't a small caddis pattern. What graylings found too hard to resist was a tiny Blue Dun. I was lucky that I had three of them in my box because it was very difficult to lure the fish with anything else. Of course, by the end of the day all three were completely destroyed and useless. I caught around 25 graylings this day. Most of them in the range of 20-25cm but several exceeded 30cm. It was great fun! The best spots were deeper pools with slow current and a stony bottom. It was useful to keep the fly on the route of floating leaves, as this is where all debris (including insects) was floating as well. Shady areas below the trees, even with shallow water, were also promising. For some reason, I only caught a single trout. Perhaps the flies were too small or the graylings too determined.
I'll try using similar flies in similar places across Luxembourg as well. I'll let you know how it went.