Biological Survey — Erie-Niagara Watershed 



207 



town, New Jersey have large daplinia producing plants in oper- 

 ation. In the next place it is essential to investigate the permeabil- 

 ity of the parasite eggs to selective dyes, and lastly, to determine 

 the resistance of copepods to freezing and dessication. As a result 

 of the experimental work outlined it is hoped that the bass tape- 

 worm may be eliminated from the hatcheries which are planting 

 these fish. 



Infection of Lake Erie Fish by the Broad Tapeworm of 

 Man. — Although a routine examination was made of 46 different 

 species of fish from Lake Erie and tributary streams only a few 

 of the results can be noted here. Nearly every species of fish 

 examined was infected with some species of helminth. However 

 particular attention was paid to the intermediate hosts of the broad 

 tapeworm of man {DiphyUohothrium latum). The following table 

 summarizes the results of the examinations of the usual inter- 

 mediate hosts. In no cases were plerocercoids of this worm 

 recovered. 



Table 1. — Showing Results of Examinations for the Broad Tapeworm of Man 



These records are published in this account because of the im- 

 portance of all data on this particular helminth. 



