NOTES ON THE FOOD AND PARASITES OF SOME FRESH-WATER 
FISHES FROM THE LAKES AT MADISON, WIS. 
By Wi.uram 8. MarsHauy and N. C. GIvBert. 
The following observations regarding the food of some of our fresh- 
water fishes and the parasites living on or within them were nearly all 
made during the spring, summer, and autumn of 1902 and 1903. The 
fishes were examined principally for their parasites, but in connection 
with that examination it was decided to note the food contents of each, 
since this could easily be done after the fish had been opened for para- 
sites. The work originally planned was much more extensive than the 
following notes would indicate, but the removal of one of us from 
Madison brought it to an end before very much had been accomplished. 
Doubting that there would be opportunity to continue and complete 
the work as it had been laid out, it was thought best to publish the 
following notes, although but very few specimens of some species of 
fishes have been examined. The stomaclrcontents were not kept, and 
we have only our original notes to refer to, which makes impossible + 
more exact determination of all we found. 
The lakes from which the fishes were taken are adjacent to Madi- 
son. Lake Mendota, the largest, bordering in part on the University 
grounds and being thus easy of access, furnished the most of our 
material. Lakes Monona and Wingra were both visited, but only a 
comparatively small number of fishes was taken from either. A few 
of the black bass were sent to us from Round Lake, Washburn County, 
Wis. 
The fishes were in part caught with hook and line, but the greatest 
number were taken with a trammel net. A map of Lake Mendota 
was platted so that we could record quite accurately the part of the 
lake from which each fish was taken, this information to be used in 
determining what differences, if any, the bottom, plants, depth, etc., 
made upon the food of the fish and, through the food, upon the kind 
of parasites found. Our notes have been carefully examined with this 
in view, but without any definite results, the fish from one part of the 
lake averaging, as a rule, the same as the fish from any other part. 
This does not, however, hold true for perch caught near the shore 
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