The Inhabitants of the Aquarium in 



number, and consequently a greater variety, 

 can be kept in an aquarium of moderate size. 



To facilitate the description, the illustra- 

 tion shows the different external parts of the 

 fish and the terms used in the text for their 

 designation. 



Of all fishes the Carp family furnishes 

 the most valuable and showy varieties for 

 the aquarium. 



The Gold Fish (Carassius auratus) is by 

 far the best known and the most popular of 

 all aquarium fishes. It is very closely re- 

 lated to the carp and shares some of its most 

 important qualities, such as long life, great 

 hardiness and easy and quick propagation. 

 Great gold fish hatcheries exist in Maryland, 

 New York, Ohio and Indiana, but even with 

 the immense numbers of fishes coming from 

 these states, the demand exceeds by far the 

 supply, so that after the American hatcheries 

 have exhausted their stock, we have to sup- 

 ply the market with large quantities of gold 

 fish from Italy, where they are hatched and 



