126 Fresh Water Aquarium 



the scaly fish, needing a higher temperature 

 than the latter. It is remarkable that the 

 young of the scaleless fish show their true 

 color in the first lew weeks of their life. 



To he successful with all different varieties 

 of gold fish they should either he kept by 

 themselves, or together with only such fishes 

 as are harmless and not aggressive. 



The Green Tench (Tinea vulgaris) is an in- 



Fig. 56. Green Tench, Tinea vulgaris. 



traduction from Europe, where it is fre- 

 quently seen in aquariums, although as an 

 aquarium fish it is of merit only so long as 

 it is young. 



The color of the young fish is a greenish 



