66 



AMPHIBIANS AND FISHES. 



usually move in shoals, hence it is necessary to keep 

 several of them together. 



The roach (Cyprinus rutilus, or Lenciscus rutilus] 

 is an attractive object in the aquarium, although 



Fig. 25. 



The Roach (Cyprinus rulilus, or Leuascus rutihis) and Dace 

 (L. vulgaris). 



more difficult to keep than many of those we have 

 mentioned. When young, and free from the black 

 cancerous growth on the scales which disfigure so 

 many of the older and larger fish, it is so active and 



