UNITED STATES DEPARTMENT OF THE INTERIOR 



FISH AND WILDLIFE SERVICE 

 BUREAU OF COMMERCIAL FISHERIES 



FISHWAY RESEARCH AT THE FISHERIES-ENGINEERING 

 RESEARCH LABORATORY 



By 

 Gerald B. Collins and Carl H. Elling 



U.S. FISH AND WILDLIFE SERVICE 

 CIRCULAR 98 



Washington, D.C. 

 November 1960 



For sale by the Superintendent of Documents, U.S. Qovcmment Printing OfBce 

 Washington 25, D. C. - Price 20 cents 



