.HIGH WINDOWS 

 AROUND ENTIRE 

 WALL 



INSULATION 



INCANDESCENT 



LiQHTS 



ELECTRICAL SERVICE 

 AIR, COLD WATER AND 

 WARM WATER 



40-QALLOM 

 TANKS WITH 

 OVERFLOW AND 

 DRAIN 



FLOOR DRAIN 





1. Sectional view of a general purpose aquarium build- 

 ing. 



works relevant to fishes' response to length of illumi- 

 nation. Some fishes show marked photoperiodicity in 

 their spawning behavior. 



The importance of fight to plants is readily ob- 

 served, however, and the intensity of illumination is 

 frequently based more on the requirements of aquar- 

 ium plants and the requirements for the control of 

 algal growth than upon the possible needs of the 

 fishes. The recommendations on lighting that follow 

 are based largely on supposition and experience. 



Natural lighting for the aquarium building is fur- 

 nished by the windows suggested in the building plan. 

 Gordon (1950) rather strongly recommends fighting 

 from directly above, but no strong evidence indicates 

 that this is essential. Due to problems in heating and 



