When I am fly fishing the Salmon River in Pulaski New York for Steelhead my go to fly is always a light pink or orange egg pattern. Normally it’s a three loop pink lady. Nine time out of ten this fly will bring fish to the net. However there are some days when egg patterns just won’t do it.
These are normally sunny days when the temperature rises more than few degrees through out the day. When this happens and the fish won’t hit an egg pattern, it is most likely due to a stone fly hatch. When the stones are hatching the steelhead are going to be eating them.
If you are have been fishing egg patterns with no luck for more than an hour your best bet is to switch over to a stone fly pattern. I like to keep a variety of stone flies in my fly box as some days different color combinations or sizes make the difference. Over all I have found that a number 10 black stone will do the trick just about every time.
One last thing. Fish the stones just as you would an egg pattern with a few split shot pinched on the line under a strike indicator or with a dropper rig for your weight. The only difference is that you want to let your line swing at the end of the drift. Many times you will get a strike as the fly starts to lift from the bottom. Good luck and tight lines.
Wayne-o's Guide Service 
We had a day like that in early November. They wouldn’t touch any fly that looked like a Vegas show girl. Some kind of black stone/nymph/buggy thing? Yahtzee!