278 American Fisheries Society 



open-surfaced pond, the dissolved oxygen content of the pond, 

 and the capacity of the pond to support the top-feeding fish, 

 Gamhusia affinis. 



Specifically also, there is a direct correlation between the 

 presence of a heavy mat of surface-growing aquatic plants 

 (Lemna, Spirodela, and Wolffia) in a small pond, the dissolved 

 oxygen content of the pond, and the capacity of the pond to sup- 

 port the top- feeding fish, Gamhusia affinis. 



