172 



EUGENE L. NAKAMURA 



of laminated plastic, measure i/jo by 72 by 

 51 inches, and are perforated by l^-inch 

 holes spaced 1 inch apart. Water sprays 

 onto the top tray from %-inch holes in 

 the sides of the 2-inch inlet pipe. 



The concrete fish pool is enclosed in a 

 quonset hut. Water flows by g:ravity from 

 the sump into the pool. 



This new system appears to be satisfac- 

 tory. Rust is no longer a problem. The 

 pH has been raised to 7.8-8.0. The trays 

 are easily accessible by opening the ends 

 of the aerator. There is practically no al- 



gal growtli in the pool, and the observation 

 through the water surface is excellent. 



LITERATURE CITED 



Nakamura, Eugene L. 



1960. Confinement of skipjack in a pond. 



Proceedings of the Hawaiian Academy of 



Science. 35tli Annual Meeting, 1959-60. 24 



pp. (Abstract). 

 SvERDRUP, H. U., Martin W. Johnson, and 



Richard H. Fleming. 

 1942. Tlie oceans ; their physics, chemistry, 



and general biology. Prentice-Hall, New 



York. 1087 pp. 



