Many of the fish on display come from 

 National Fish Hatcheries— the Bureau of 

 Sport Fisheries and WildHfe operates about 

 100 of these throughout the country. The 

 aquarium staff also collects specimens from 

 the wild; and by trading with other aquariums 

 around the country (fish are sometimes shipped 

 thousands of miles in special plastic containers 

 supplied with oxygen) the National Aquarium 

 adds new kinds of fish to its collection. 



An effort is made to display the fishes in 

 species groups found living together in the 

 wild. This cannot be done in every case, for 

 the fish must be "compatible"— it would be 

 impractical to try to keep large bass or preda- 

 ceous pickerel in a tank with shiners or other 

 small minnows, since constant replacement of 

 the smaller fishes would be necessary. 



Around a public area about 130 by 50 feet 



FRESH-WATER TURTLES 



XJ. 



