This report describes the construction of a telemetering depth- 

 measuring instrument to be used -with midwater trawling devices in 

 exploratory fishing and gear research. The objective in developing 

 an instrument of this type is to enable the research fishing vessel 

 to lower the midwater trawl to the exact depth zone where concentrations 

 of fish occur, as determined by echo-sounding equipment. The work was 

 done, under contract with the Fish and Wildlife Service, by the Marine 

 Laboratory of the University of Miami, F. G. Walton Smith, Director. 

 An existing and workable device, which was developed by the Woods Hole 

 Oceanographic Institute and ■which was described in an unpublished manu- 

 script by Willard Dow, was redesigned to meet specified requirements. 

 The authors appreciate the cooperation of Reidar Sand, project leader, 

 and the staff of the Fish and Wildlife Service station at Coral Gables, 

 Florida. 



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