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LenHarris 08-10-2010 10:57 AM

Gill Lice

The Majority of streams I have fished this year in the driftless area with a brook trout population have GILL LICE.

The Stream Of Time: Gill Lice In Many Southwestern Wisconsin Streams

mcnerney 08-10-2010 02:58 PM

Re: Gill Lice
Len: That is interesting, thanks for sharing!


Frank Whiton 08-10-2010 03:56 PM

Re: Gill Lice
Hi spinner,

Here is some information about Gill Lice in Michigan. It seems like it doesn't kill the fish.


Effects of Gill Lice (Salmincola edwardsii) on Brook Trout (Salvelinus fontinalis) in Lakes

L. N. Allison and W. C. Latta

Abstract.-Six small lakes (3-10 acres) stocked annually with brook trout at the Pigeon River Fisheries Research Station, Vanderbilt, Michigan, have well established populations of S. edwardsii. This parasite was considered a possible cause of natural mortality of fish in these lakes. Objectives were to measure parasitism of gill lice on brook trout in relation to condition and rate of natural mortality of fish, and possibly identify factors influencing development of gill lice populations. Annual trout population estimates were made. Monthly samples of fish were taken from each lake January through December, 1964. Gill lice on each trout were counted and classified as to stage of development. Reproduction continued throughout the year. No relationship was found between parasitism and condition and rate of natural mortality of brook trout. Development of gill lice populations was not influenced by a summer decrease in volume of water with suitable temperature and oxygen characteristics for trout. Degree of infestation was most influenced by degree of infestation of older fish in each lake. In four lakes gill lice populations developed exponentially, and the rate of increase was inversely related to initial number of gill lice on fish.

LenHarris 08-10-2010 07:03 PM

Re: Gill Lice
Stress on top of the gill lice is fatal.

Wisconsin weather and stream temps are at critical now and if you

are from Wisconsin....give the brookies a break and go swimming instead.

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