ACKNOWLEDOIENTS 



in the processing and presentation of these 

 data. 



The authors wish to acknowledge the 

 assistance of Dr. Richard H. Fleming and 

 members of the Department of Oceanography of 

 the University of Washington in establishing 

 the Oceanographic Section of the Pacific 

 Salmon Investigations, and in equipping the 

 charter vessels for the oceanographic work. 



We are indebted to Ralph W. Riley for 

 assisting in the chemical analyses and 

 Phillip Seelinger for the plankton analyses. 



Acknowledgment is made to the Fisher- 

 ies Research Biologists and crew members 

 aboard the respective vessels for their 

 assistance to the field personnel, and to 

 the members of our staff that participated 



SEA SURFACE 



-ORANGE PAINT 



FORWARDING ENVELOPE 



CLEAR GLASS 



SAND BALLAST 



CORK STOPPER 

 SEALED WITH PITCH 



SUMMARIES OF OBSERVATIONS 



Sta. Hydrographic station 



Set Gill-net-set numbers at this position 



GCT Median hour between messenger times, 



in GCT (For median hour of plankton 

 hauls, see Plankton Data) 



Date Date of hydrographic cast 



D Interpolated depth in meters 



(Extrapolated depths enclosed in 

 parentheses) 



BT Bathythermograph lowering 



T Temperatures 



CI Chlorinity samples 



Dissolved oxygen samples 



P PO^-P samples 



PI Plankton samples 



1 Horizontail haul 



2 300 m. to thermocline 



3 thermocline to surface 



4 300 m. to surface 



5 1, 2, 3, 4 



Figure 2.--U. S. Fish and Wildlife 

 Service drift bottle. 



