UNITED STATES DEPARTMENT OF THE INTERIOR, Stewart L. Udall, Secretary 



FISH AND WILDLIFE SERVICE, Clarence F. Pautzke, Commissioner 



BUREAU OF Commercial Fisheries, Donald L. McKernan, Director 



A TOWED PUMP AND SHIPBOARD 



FILTERING SYSTEM FOR SAMPLING 



SMALL ZOOPLANKTERS 



by 

 Charles P. O'Connell and Roderick J. H. Leong 



United States Fish and Wildlife Service 

 Special Scientific Report— Fisheries No. 452 



Washington 25, D.C. 

 May 1963 



