Gill Lice In Popular Driftless Stream

Discussion in 'Fly Tying, Trout Fishing' started by spinner, Jun 21, 2010.

  1. spinner

    spinner Staff Member


    I sent this photo to Dave V and asked him if this Gill Lice was a serious threat.

    This was his response:

    It is unlikely gill lice will destroy all of the brookies in **** Creek although I have seen infestations that were heavy enough (***** Creek, Monroe Co.) to interfere with the fish's respiration leaving them vulnerable if dissolved oxygen levels are reduced. The infestations seem to worsen when fish are stressed (low water levels or high water temps) but may totally disappear when conditions are good. We are aware of the problem and will continue to monitor but there is little that can be done (the only good way to remove gill lice from fish is with a formalin dip).​

    David Vetrano
    Fisheries Supervisor
    3550 Mormon Coulee Rd.
    La Crosse WI, 54601
    [email protected]

    I have another email out to Dave asking if the gill lice can be transferred by an angler to another stream on gear/net/waders. Will update when he responds.
    Last edited by a moderator: Mar 20, 2015
  2. spinner

    spinner Staff Member

    follow up

    Anglers should get in the habit of disinfecting their waders, shoes and landing nets that touched stream water or fish before they move from one stream to another to prevent transfer of a variety of diseases and parasites. We use a 1% bleach solution to rinse off our waders and electrofishing gear before we move from stream to stream when we are doing fish surveys (a small spray bottle works well for waders). If you're not going to fish for awhile, letting your gear dry completely can also be effective (most aquatic parasites cannot tolerate dessication).​
    [/COLOR] ​
    Last edited by a moderator: Mar 20, 2015

  3. Steve

    Steve Staff Member

    Are these lice an invasive species from some other country?
  4. spinner

    spinner Staff Member

    they are from unclean stocked fish

    they usually come from unclean stocked trout.