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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

Size #10-12 Color Pattern Suggestions
Length 9 - 10 mm.; 3 tails.. Body dark reddish brown; Hares Ear Soft Hackle
    Pheasant Tail Soft Hackle
    Pheasant Tail
    Hares Ear Soft Hackle
    Iron Dun Wet fly
.

Adult

Size  #10-12 Color Pattern Suggestions
length 9-11 mm.; 2 tails; Body tannish olive; Std. Thorax March Brown
  wings mottled medium gray Parachute Adams
    Comparadun/Sparkle Dun
    IIrresistable Wulff
    Parachute Hares Ear
    March Brown Parachute
 
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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