COVER: Positioning of air hose (a perforated polyethylene 

 pipe) through which air was pumped to create an air bub- 

 ble curtain to control migration of alewives in the Milwau- 

 kee River. SCUBA divers aided project. (See page 1.) 



UNITED STATES DEPARTMENT OF THE INTERIOR 

 STEWART L. UDALL, SECRETARY 



STANLEY A. CAIN, ASSISTANT SECRETARY, 

 FISH AND WILDLIFE AND PARKS 



CLARENCE F. PAUTZKE, COMMISSIONER, 

 nSH AND WILDLIFE SERVICE 



DONALD L. MCKERNAN, DIRECTOR, 

 BUREAU OF COMMERCIAL FISHERIES 



