194 Wisconsin Academy of Sciences, Arts, and Letters, 
Table 4. Summary of the average infection with fish parasites in five Wis¬ 
consin laJces during summer. + indicates less than 0.01 per cent. 
Geneva 
Mendota 
Pepin 
Green 
Michigan 
Trematodes . 
0.31 
0.09 
0.51 
0.09 
0.28 
Trematodes, encysted. 
1.25 
0.46 
0.10 
1.70 
0.12 
Tapeworms . 
0.39 
0.23 
0.67 
0.45 
0.50 
Tapeworms, encysted. 
0.12 
0.28 
1.19 
0.09 
0.06 
Nematodes . 
0.04 
0.05 
0.07 
0.01 
0.27 
Nematodes, encysted... 
0.02 
0.13 
+ 
+ 
0.11 
Acanthocephalans . 
0.24 
0.12 
0.18 
0.41 
1.79 
Acanfhocephalans, encs^ted. 
0.04 
0.12 
0.10 
0.12 
0.08 
Unknown cysts . 
0.06 
0.49 
1.36 
0.12 
0.14 
Leeches . 
0.01 
0.02 
0.02 
0.02 
0.03 
Glochidia . 
— 
+ 
0.80 
— 
0.01 
Copepods . 
+ 
+ 
+ 
— 
0.32 
Protozoan cysts . 
— 
+ 
— 
— 
- 
Parasitic fishes. 
— 
— 
+ 
— 
— 
Total average infection®; parasites per fish. 
Average number of species of fish infected by 
each parasite. 
Average number of infections by all species of 
parasites. 
2.3 
2.0 
5.0 
3.0 
3.9 
6.6 
4.7 
5.0 
8.1 
5.3 
2.2 
1.4 
1.5 
2.1 
2.1 
