Insects and other foods the trout may be eating:
1.   Blue-winged Olives
2.   Little Black Winter Stoneflies
3.   Quill Gordon Mayflies
4.   Blue Quill Mayflies
5.   Little Brown Stoneflies
6.   Little Black Caddis (American Grannoms)
7.   Hendricksons and Red Quills
8.   Little Short Horned Sedges
9.   Sculpin, baitfish and small crayfish (Imitate with streamers)
10  Midges

American March Browns - Emergers
The American March Brown nymphs emerge near the surface.  The problem
becomes determining when a hatch is occurring. As I previously said, a March
Brown dun or two may indicate the mayflies are hatching. You almost never see
very many duns at any one time. You also have to consider the hatch in the park
may last for as long a two months, depending on the location. They even hatch on
the same section of water on a stream for a very long time. They may come off
anytime from mid-morning to dark. It depends on the weather at the particular time
they are hatching. This can vary greatly within a two month period.

Almost any area of fast water has March Brown nymphs so choosing one area over
another is usually not the solution. If you are fairly sure that you are fishing an area
of the stream where they are hatching, and you have spotted a dun or two, then you
should at least try an emerger. I suggest using an imitation of the emerger before
you try an imitation of the dun. The odds are usually better with the emerger.

On most occasions, you will probably find the action slow when you are trying to fish
this hatch. If you are only seeing a dun every hour or two, you may be better off
imitating another insect.

There are usually several other mayflies, caddisflies and stoneflies that hatch
during the same long period of time the March Browns hatch. You may be wise to
choose another strategy. It may seem like I'm downplaying the March Brown hatch
and that isn't my intension. You just have to use trial and error to determine what
the best strategy is on any given day during the long hatch. At the right time and
place, you could be very successful. The results varies considerably and there may
be other insects that are more important to imitate at the time.

I suggest an upstream, or up and across approach when you are fishing an imitation
of the emerger. At "Perfect Fly", we have two types of emerger imitations. One is the
plain emerger and the other a trailing shuck version. You should determine which
type of emerger fly works best by trail and error.

If you use a trailing shuck imitation of the emerging dun (and we suggest you do),
you should fish it unweighted and just allow it to drift drag free in the margins or
current seams where the fast water meets the slow water of pockets and other type
edges. I doubt that there will ever be enough of the March Browns hatching for the
trout to feed selectively on them but I do think the trout may see enough of them to
be easily fooled with a good imitation.
Thumbnail: Click to Enlarge
"Perfect Fly" American March
Brown Emerger with a trailing