square mile survey area was not covered on any single cruise 

 (Figures 1-13; Table 1). The area off northern California (lines 

 43-57) was covered on only one cruise, in October; 3 stations 

 only were occupied in July. Coverage off central California 

 (lines 60-70) was more consistent with stations occupied in 

 January, April, May, July, and October. The area from just 

 north of Pt. Conception, California to Pt. San Juanico, Baja 

 California (lines 73 or 77-137) was surveyed monthly, except for 

 March, when coverage began on line 83, and November and December 

 when it extended south only to San Diego (line 93) . The area off 

 southern Baja California (lines 140-157) was surveyed in January, 

 April (to line 147) and August (to line 153) . Coverage extended 

 seaward to station 145 (ca. 370-450 miles offshore) on two lines 

 in May but typically did not extend beyond station 90 (ca. 160- 

 250 miles offshore) . Heaviest coverage was during January, 

 April, May, and July when 250 or more stations were occupied on 

 each cruise. Seventy-five or fewer stations were occupied in 

 September, November, and December. 



Seven vessels were employed on these cruises: the Black 

 Douglas and Hugh M. Smith of NMFS and the Spencer F. Baird , 

 Horizon, Orca , Paolina T, and Stranger of SIO. One to four 

 vessels participated on each cruise with three being the usual 

 number. The Orca was used on all cruises except 5911, the Black 

 Douglas was used on 8 cruises (January, February, May-October) , 

 and the Paolina T was used on 7 (February-July, November) . The 

 other 4 vessels were used on a total of 6 cruises. 



SAMPLING GEAR AND METHODS 



The standard CalCOFI net used from 1949 to 19 69 had a 1-m 

 diameter mouth opening (0.785 m area) and an overall length of 

 about 5 m. The net was constructed of 3 0xxx gauze, a heavy duty 

 grade of silk bolting cloth, with a mesh size of 0.55 mm after 

 shrinkage. The last 40 cm of the cone and the cod end were 

 constructed of 56xxx grit gauze which had a mesh size of 0.25 mm 

 after shrinkage. On parts of 2 cruises during 1959 (5901, 5908) 



1 

 CalCOFI lines (Figure 14) are arranged perpendicular to the 



coastline and extend from the Canadian border (line 10) to below 



Cape San Lucas, Baja California (line 157) . Stations were 



established on the basis of a perpendicular to line 80 (off Pt. 



Conception) at a point designated as station 60. Stations were 



plotted seaward and shoreward from station 60 on each line. 



Cardinal CalCOFI lines (those ending in "0") are 120 miles apart 



and usually bracket two ordinal lines (ending in "3" or "7") , so 



that lines are 40 miles apart over most of the pattern. Cardinal 



stations are 40 miles apart and typically these are separated by 



a station number ending in "5" so that stations are 20 miles 



apart out to station 90 on most lines. Stations are placed at 



closer intervals near the coast and islands to accommodate these 



features (see Fig. 14 and Kramer et al., 1972 for further 



details) . 



