FIELD PROCEDURE 

 Vessels and observers 



MV Pioneer 15 April - 11 July Glenn Pedersen 



12 July -- 1 Sept. AlanH.Haselwood 



MV Tordenskjold 15 April - 16 June Henry Sakuda 

 17 June - 3 Sept. Charles Hebard 



Field personnel assisted in the data 

 tabulation and reduction. 



Stations 



Both primary and secondary oceano- 

 graphic stations are shown in figure 1, 

 Primary stations occurred at the fish- 

 ing locations and included hydrographic 

 casts to 1,050 meters, a BT trace, 

 vertical plankton hauls, and a surface 

 trawl. Secondary stations included only 

 a hydrographic cast to 325 meters and 

 a BT trace. 



Routine 



The shipboard work was similar to 

 that reported in 1958 (Favorite and 

 Pedersen, 1959). After the nets were 

 set, the observers completed the fol- 

 lowing primary station routine: 



Deep cast--Four Nansen bottles, 

 each carrying two protected deep-sea 

 reversing thermometers and one vm- 

 protected, were cast to 400, 500. 700 

 and 1,050 meters. 



Shallow cast- -Eleven Nansen bot- 

 tles, each carrying two protected ther- 

 mometers and the bottom six carrying 

 one unprotected also, were cast to 10, 

 20, 30, 50, 75, 100, 125, 150, 200, 250 

 and 300 meters. 



Surface observation- -The tem- 

 perature was recorded from a bucket 

 sample by using a 0-20° C. dipping 

 thermometer with 0.1° C. subdivisions. 



BT lowering- -The BT was lowered 

 to 275 meters. 



Water samples--Dissolved oxygen 

 samples were drawn from all Nansen 

 bottles, placed in standard dark bottles 

 and fixed innmediately. Chlorinity 

 samples at depth were obtained from 

 all Nansen bottles. The surface chlo- 



rinity sample was obtained by using a 

 plastic bucket. Samples were stored in 

 citrate bottles fitted with rubber gasket 

 stoppers. 



Plankton hauls- -Vertical hauls 

 were made with a standard l/2-meter 

 net. No. 6 mesh, at about 50 meters 

 per minute from 30 and 150 meters to 

 the surface. The samples were treated 

 with 10 percent formalin neutralized 

 with sodium borate. 



Upon completion of the above routine, 

 about one hour a^fter evening twilight, 

 the trawl was towed at the surface in 

 the vicinity of the gill nets at 6 knots 

 for 15 minutes, weather permitting. 



The secondary station routine, ob- 

 served at points midway between fish- 

 ing locations, usually occurred at noon 

 and resulted in observations at inter- 

 vals of 30 nniles. Because of time 

 limitations, observations were reduced 

 to: 



1. BT lowering- -to 275 meters. 



2. Shallow cast--Procedure the 

 same as at the primary station, except 

 that the bottom bottle was cast to 325 

 meters, depth permitting. Near the end 

 of the season and enroute to Seattle, 

 the depth of the bottom bottle Twas 

 changed to 525 ncxeters. 



Usually, additional BT's were taken 

 between the primary and secondary 

 stations, and drift bottles were released 

 at designated locations, which are listed 

 under the tabulated data. 



CHANGES FROM 1958 FIELD WORK 



As in 1958, the locations of the 

 oceanographic stations were dependent 

 on the positions of the fishing sets, and 

 storms necessitated several modifica- 

 tions in the original cruise plans. 



Cruise plans 



In 1959, in order to obtain more 

 knowledge concerning the distribution 

 of salmon, the limits of the investiga- 

 tion area were expanded- -westward 



