About the Yellow Thomas Mayfly Trout Fly
  The Yellow Thomas Mayfly or common mayfly, is  a dainty yet large insect, found in abundance in spring and early summer although occasionally it can also be found well into autumn.
  
  
  
  
  
  This trout fly is designed to be fished on Dams & Reservoirs, Rivers & Streams, Still Water
  
  
   
  
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