520 REPORT OF THE COMMISSIONER OF FISHERIES. 
Twenty-two of these fish contained but one kind of food, and then 
generally but one or two specimens of the latter was large. One bass 
had eaten 4 minnows and another 2 frogs. 
Forbes (¢, d) found that this species of black bass contained about 
the same variety of food as recorded by us; he found that fish con- 
stituted the largest percentage of food, and in much smaller quantities 
crawfish, insect larve, and alge. 
None of the bass we examined was free from parasites, the nearest 
approach being one fish from which we took but a few cysts in the mesen- 
tery. Cestodes were more prevalent than any other parasites, although 
Acanthocephala were nearly as numerous. The following table gives 
the places in which parasites were found, and the number of fish in 
which each kind was present: 
: Csopha- | 47, | Cexecal ae 
Mouth. gus, cee Aneel Intestine. 
PRE TINA CO CCS ea ys a atone alert oincen clea er aiete mre Aeon cieteyste 8 2 | 20 4 1 
CWCStOMESIES sakcncm= Soros Seca oad mcnels seiewiete cctaonel] scteeceie: ates oecees 10 3 28 
INKSUUGRIOY Keisis See SoS ORR ad Gee BER ere Bee e neenspi ereaertal aide Saaecee 4 a 7 
PACAMPROCED NALA ssec ase eeee ese etaler epee cee ci seminciese eacooccl|lsasseecncosus 9 3 28 
Copepods (Ergasilus) on gill, 4; cestodes in ovary, 4; cysts in mesentery, 1; cestodes in body cavity, 
1; cysts in liver, 2. 
The trematodes were Azygia tereticolle, A. loossii, Cecincola par- 
vulus, and Leuceruthrus microptert. One of the cestodes was a species 
of Proteocephatlus. 
12. Perca flavescens, yellow perch. 
The perch, caught mostly with hook and line, were taken from 
Lakes Mendota, Monona, and Wingra—all but a few from the first- 
mentioned lake. The Lake Mendota perch were nearly all caught near 
the shore, a few only coming from deep water. An exception to this, 
however, was a lot of perch, 16 in number, purchased in February 
from fishermen, who caught them through the ice at quite a distance 
from shore and in deep water. The food and parasites of these were 
quite different from what we found in the others, and, although at 
present included with the others, separate mention of them will be made 
later. Excepting these, all were caught in April, May, or July—more 
during May than at any other time. 
Seventy-two perch were examined, in only 9 of which were para- 
sites absent. A few of the others had no parasites in the alimentary 
tract, bat contained cysts in the mesentery or liver. Fifty-six of the 
perch contained food the nature of which we could determine, and of 
the remaining 16 a few had food remains in the lower part of the 
intestine or in the rectum nothing as to the nature of which was 
recognizable. The following table gives the different kinds of food 
and the number of fish in which each kind was found: 
