20 
Bulletin Wisconsin Natural History Society [Vol. 13, No. 1 
Food — Insect larvae 21, Insecta 16.3, Arachnida .3, Hyalella + , Ostra- 
coda 33.9, Cyclops .5, Cladocera 1.2, Mollusca .9, Oligochaeta 1, Nematoda 
.7, Protozoa .1, plants 17. 
IV. GENERAL REMARKS 
Of the sixteen species of fish examined, nine obtained their 
living largely from insects or their larvae, i.e., four Centrarchidae 
(basses, sunfish), two darters, and miller's thumb, the silversides. 
Among the other seven: two had the major part of their food 
from ostracods, two from copepods, one from cladocerans; thus 
making entomostracans the major food of six. The remaining 
two, Notropis heterodon and N. cayuga had eaten a diet consisting 
of more than half mud, silt, and fine debris from the bottom. 
Table 1 shows summaries of the principal classes of food for each 
species. 
TABLE I 
The food of small fish collected at Madison, Wisconsin, during August, September, 
and October, 1914 
SPECIES 
PER CENT 
OF FOOD 
Ave. size in mm. 
No. examined 
Fish 
Insect larvae 
Insecta 
CO 
V 
Hyalella 
Ostracoda 
e3 
~a 
o 
a 
a> 
a 
o 
O 
Cladocera 
Mollusca 
Oligochaeta 
Hirudinea 
Nematoda 
Trematoda 
j Rotifera 
Protozoa 
Plant remains 
Algae 
Silt and debris 
Lepomis pallidus 
33.1 
49 
22.8 
26 
1.2 
23.1 
.7 
16.4 
31 
i 
0.2 
+ 
+ 
' 1 3 
0.4J 
Micropterus salmoides 
1 77.8 
27 
14.2 
31.2 
38.6 
3.8 
+ 
2.5 
1.6 
Micropterus dolomieu 
78. o' 
2 
10 
90 
Ambloplites rupestris 
71.6 
5 
68 
.4 
5.6 
1 
15 
: 4 
0.2l 0.4 
Perea flavescens 
107.7 
16 
19.5 
2.7 
.5 
32.8 
.3 
.2 
36.3 
.3 
Boeleichthys fusi- 
formis 
72.4 
7 i 
84 
6.7 
2.4 
.1 
.3 
+ 
6 
Belosoma nigrum 
32.9, 
2 
75 
.5 
24.5 
+ 
Cottus ictalops 
54 . 7 1 
10 
73.1 
1.5 
13.5 
.5 
1.5 
9 
.9 
Schilbeodes gyrinus. . 
24.9 
5 
8 
4 
4 
.4 
62 
1.6 
4.2; 15 
Ameiurus me las 
94 
2 
40 i 
2.5 
1.2 
2.5 
26 
+ 
17.5 
Fundulus majalis 
menona 
41. 2 ( 
49 
9.1; 
3.2 
1 
16.2 
25.2 
1.2 
27 
.1 
+ 
+ 
14.8 
- 1 
Labidesthes sicculus.. 
40.2 
50 
5.1 
4*-4\ 
.1 
+ 
8.1 
27.3 
+ ' 
+ 
2.5 
8 | 3.3 
Notropis heterodon . . 
40.7 
47 
4.4 
4.8 
1.4 
2.7 
2.1 
3.2 
2.7 
+ 1 
+ 
+ 
3 I 
5 \52.1 
Notropis cayuga 
34 
20 
2.9 
1.3 
1 
7.8 
2.9 
5 
+ ! 
3.4 
4 1 77.4 
Eucalia inconstans. . . 
42.4 
50 
15.9 
16.5 
.5 
.2 
3.6 
28.5 
14.9 
6.4 .3 
+ : 
+ 
0.4 
.7 4.6 
Umbra limi 
38.8 
60 
21 ' 
16.3 
.3 
+ 
33.9 
.5 
1 
1.2 
•1 1 
.7 
.1 
1.9' 
15.1 
