United States Department of the Interior, Fred A. Seaton, Secretary 

 Fish and Wildlife Service, Arnie J. Suomela, Commissioner 



ESTIMATING MAXIMUM FISHING DEPTH OF LONGLINE GEAR 

 WITH CHEMICAL SOUNDING TUBES 



By 



Joseph J. Graham 



Fishery Research Biologist 



Pacific Oceanic Fishery Investigations 



Honolulu, T. H. 



and 



Dorothy D. Stewart 



Special Scientific Report--Fisheries No. 285 

 WASHINGTON: December 1958 



