COPEPOD PARASITES AND MUSSEL GLOCHIDIA ON FRESH -WATER FISHES. 337 

 RELATIONS BETWEEN THE COPEPODS AND THE GLOCHIDIA. 



We have just discussed the relations between the fish and the copepods, but both 

 COpepods and glochidia infest our common fresh-water fishes. Consequently, in view 

 of the efforts which are being put forth by the United States Bureau of Fisheries for the 

 success of artificial mussel propagation it becomes imperative to know whether the 

 habits of these two kinds of parasites are harmonious or antagonistic. Does the presence 

 of copepods upon our common fishes influence in any way their susceptibility to infection 

 by mussel glochidia ? This problem can be most intelligently discussed in the form of 

 a series of questions and answers. 



I. Are the fish that serve as hosts for the copepods those which are naturally susceptible 

 to infection by glochidia? 



This question can be best answered by arranging in tabular form a list of the fishes 

 with their glochidia and copepod parasites in parallel columns. 



