June, 1919] 



Fauna of Rock Bottom Ponds 



453 



The fish were, of course, artificially introduced. The turbid- 

 ity of the water made it impossible to see them and thus gain 

 even an approximate idea of how many there were. Their num- 

 bers were probably not great, due both to the size of the pond 

 and to the fact that the youngsters of the neighborhood caught 

 them frequently. The general appearance of the pond did not 

 leave the impression that it was a particularly suitable environ- 

 ment for fishes. However, so far as food was concerned there 

 could have been little difficulty in view of the enormous amount 



Station 3 of Pond III. 



of insect life and the great quantity of algae. The presence of 

 young catfish and of hatching eggs showed that this species 

 was able to propagate. There was no evidence of breeding on 

 the part of the sunfish. 



The stomachs of two sunfish and a catfish were examined. 

 Their contents was as follows: 



1. Eupomotis 



gibbosus 



2. Ameiurus 



natalia 



3. Eupomotis 



gibbosus 



Ephemerid nymphs, 3. 

 Chironomus larvs, 2. 



Shell of Physa. 

 Ephemerid nymphs, 2. 

 Algae. 



Ephemerid nymphs, 6. 

 Algag, considerable. 



