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

 Fish and Wildlife Service, Arnie J. Suomela, Commissioner 



PLASTIC STANDPIPE FOR SAMPLING STREAMBED ENVIRONMENT 

 OF SALMON SPAWN 



by 



Harold A. Gaingmark and Richard G. Bakkala 

 Fishery Research Biologists 

 Bureau of Commercial Fisheries 



Special Scientific Report: Fisheries No. 261 



Washington, D. C. 

 November 1958 



^ 



