50-GALLON TANKS 



are 47 wall display tanks 3 to 10 feet long, 

 with water capacities of 50 to 2,000 gallons 

 each. The tanks are aquascaped with sand, 

 gravel, boulders, sunken logs, and water plants 

 to resemble the bottoms of the ponds, lakes, 

 and streams in which the fish normally live. 



City water flows constantly through the 

 tanks; chlorine is removed by activated carbon. 

 Since the aquarium is in a large building, no 

 heating facilities are ordinarily required for 

 the larger tanks in winter; in summer it is 

 necessary to cool the water to 56° in tanks 

 containing trout and other cold-water fishes. 



Most of the specimens are fed on Mondays 

 and Thursdays at 2 p.m., when the visitor can 

 witness more than usual activity in the tanks. 

 The smaller fish, including the tropicals, are 

 fed daily. Food is prepared in the aquarium's 

 "diet kitchen." Sheep's liver, fish fillets, and 

 natural foods for certain delicate species are 

 the usual diet. Special new foods, such as dry 

 compressed pellets containing vitamins, are 

 occasionally added to the menu. 



