UNITED STATES DEPARTJENT OP THE INTERIOR 

 J, A. Krug, Secretary 

 FISH AND WILDLIFE SERVICE 

 Albert M. Day, Director 



Special Scientific Report - Fisheries No. 5 



PRBUMENARY SURTOYS OF ROOSEVELT LAKE 

 IN RELATION TO GAJE FISHES 



by 



Harold A. Gangmark and Leonard A. Fulton 



TABIE OF CONTENTS 



Page 



Introduction • 1 



General infonnation about the area 1 



The SviTTeys 3 



Physical Characteristics 3 



Temperatures 4 



Chemical constituents 4 



Determination ofpH 4 



Alkalinity 10 



Carbon dioxide and acidity 10 



Dissolved oxygen 15 



Transparency of the water 15 



Plankton 18 



Fish populations 1^ 



Gill net sampling 18 



Sport fishing 20 



Relative size of fish populations 24 



Summary 26 



Discussion and conclusions 27 



Literature cited 29 



