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

 Fish and Wildlife Service 



CHAETOGNATHS AND PTEROPODS AS BIOLOGICAL INDICATORS 

 LN THE NORTH PACIFIC 



By 



Thomas S, Hida 

 Fishery Aid 

 Pacific Oceanic Fishery Investigations 

 Honolulu, T. H. 



Special Scientific Report--Fi3heries No. 215 

 WASHINGTON: June 1957 



