Leech Lake sample

Discussion in 'Fly Fishing Entomology' started by jwg, Jul 14, 2013.

  1. Water temperature was 58 degrees F Saturday at Leech Lake, down from temperatures in the 60s the previous two weekends.

    In the morning, fishing was slow for everyone I could see.

    This sample, see picture below, was taken midmorning from a Rainbow trout
    These looked a lot greener in reality than they do in the photo.

    I am thinking perhaps these are chironomid pupa taken while emerging.

    If so, perhaps the fly in this link would have been useful. ?


    ndmslm likes this.
  2. A couple have prominent wing pads. Those are chironomids.
  3. Yep, these are mids, and seeing little to no chroming indicates to me, that these bugs were not ready to molt out as adults for at least a day or two. These mids were likely sitting anywhere from 3" to a foot off the bottom, staging to rise at some point later. Thus the over all effectiveness of an accurate vertical presentation.
  4. Hi Jay-

    What I'm seeing in your sample are two varieties of Chironomid pupae and one Biting Midge larva, as represented by cropping the following from your photo:

  5. Roger,

    Is a "biting midge" a mosquito?

  6. Hi Tom-
    No, a mosquito is a Dipteran of family Culicidae, whereas a biting midge (sometimes also referred to a no-see-um) is a Dipteran of family Ceratopogonidae. Please see Aquatic / Semiaquatic True Fly Taxonomic Structure.
  7. Roger, thanks!


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