UNITED STATES DEPARTMENT OF THE INTERIOR 



Stewart L. Udall, Secretary 



John A. Carver, Jr., Under Secretary 



Stanley A. Cain, Assistant Secretary for Fish and. Wildlife and Parks 



FISH AND WILDLIFE SERVICE, Clarence F. Pautzke, Commissioner 



Bureau of Commercial Fisheries, Donald L. McKernan, Director 



Evaluation of a Pump and Reeled Hose 



System for Studying the Vertical 



Distribution of Small Plankton 



By 

 RODERICK LEONG 



United States Fish and Wildlife Service 

 Special Scientific Report—Fisheries No. 545 



Washington, D.C. 

 January 1967 



