AQUARIUM MANAGEMENT 



A'A INCHES 

 6 INCHES 



7Vi INCHES 



makes 14 square inches of surface 



" 2S " 

 « 44 « 



U (I 



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Surprising how rapidly the surface increases 

 as the water lowers from the top of a globe. 

 The bottom level shown will support three 

 times as many fishes as the top, and the mid- 

 dle one twice as many. The matter of how 

 far a globe is filled may make the difference 

 between failure and success. 



Fig. 3 



6 INCHES 

 XO INCHES 



28 sq. in. 



78 " " 



Fig. 4 



The modern flattened globe has a lot more style and very much more air-contact 

 surface, especially when carried a little below the top level. 



12 INCHES 



113 sq. in. 



Fig. 5 



The main intent of these diagrams is to show the practical application of the all- 

 important air-surface principle. 



These three containers are reduced in the same proportion and each has approxi- 

 mately the same water capacity. As an aquarium the lower design is much the best. 

 Theoretically, when filled, it could support eight times as many fishes as the top globe 

 filled. In practice the old style globes are almost always overcrowded, and the thing 

 to do is to take goldfish from these and place them in better-formed aquaria. However, 

 owners of flat-shaped aquaria are not to be encouraged in the possible idea that they 

 would be justified in increasing their aquarium population just because the old-style 

 globe is less efficient. 



