2032 



The Cornell Reading Courses 



h 



all of them will eat the eggs and the young of other fishes. They also 

 consume much food useful to other fishes and do not in themselves con- 

 tribute a perma- 

 nent supply of food. 

 The common chub, 

 or homed dace, is 

 especially obnox- 

 ious in this respect. 

 If the common 

 brook sucker can be 

 Fig. M)-!.-Ajncansyiaih j^^de to spawn in 



the pond, it may constitute a desirable introduction. All predaceous 

 fishes are fond of young suckers, and the latter do not enter into 

 competition with other fishes in their feeding, since most of their food 

 is obtained by scraping submerged rocks, logs, and plant stems. 





I 





4- 5 



Fig. 198. — Some common pond molluscs, i, Limnaa; 2, Physa; j, Campeloma; 4, 



Planorbis; 5, Sphceritim 



Nearly all predaceous fishes will sometimes eat their own kind, but 

 this will be reduced to a minimum if plenty of shiners and goldfish are 

 present. 



Aquatic vegetation 



Many of the plants useful in fish culture are rather generally distributed 

 over New York State, so that ordinarily one will have little difficulty 



