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The March Brown Mayfly
Emergence-March until May
Prime water temps 44-48
degrees
General Hatch Time 12noon
to 3pm
Nymph or Wetfly
Adult
The March Brown nymph is
a clinger. The nymph is found in the faster flowing rifles and runs of
many western streams. Prior to the actual hatch, the March Brown nymph
is not readily available to the trout. However, the trout will
especially key on the insect as it is ascending towards the surface or
as it is caught in the surface film struggling to emerge; this is
particularily the case in deeper runs. In the shallower riffles the
trout will focus more so on the adults.
The March Brown hatch can
be quite intense and sometimes short lived. Many times, the hatch will
last for 45 minutes and other times up to 2 hours; Rarely does it last
much longer. At times, the surface can be covered by adults. The hatch
tends to come in waves of activity. The trout's feeding activity will
replicate the waves of activity. The hatch can also occur like
clockwork. For example, if you experience a hatch of March Browns one
day in a riffle at 1pm, The next day given the same conditions the hatch
will most likely take place at the same time!
Methods of Presentation
The Dry fly presented
mostly drag free
The emerger presented
mostly drag free with a slight "hatching twitch"
A tradtional wet fly
swing -down and across
A nymph presented drag
free with a hatching twitch
A nymph utilizing a
leisenring lift
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