February and September, and line 103 the southernmost line 

 covered in June. Coverage extended seaward to station 14 

 (approximately 350-460 miles offshore) on lines 90 and 93 in 

 December (Cruise 6612) but typically did not extend beyond 

 station 90 or 100 (approximately 160-300 miles offshore) on most 

 cruises . Some inshore stations were occupied during 1966 which 

 were not covered on early CalCOFI surveys. These stations are 

 included in the data base (Table 1) but omitted from the station 

 plots (Figures 2-12) . 



Three vessels were employed on these cruises: the Alexander 

 Agassi z of SIO, the Alaska of CDFG, and the David Starr Jordan of 

 NMFS. One or two vessels participated on each cruise, with the 

 Agassiz employed on six cruises, the Alaska on one cruise (6604) 

 and the Jordan on nine (Univ. of Calif., SIO, 1968, 1969). 



Cruise 6611 was not a CalCOFI cruise but a Scripps Tuna 

 Oceanography Research (STOR) cruise numbered TO-66-1 conducted 

 aboard the NMFS vessel David Starr Jordan. Coverage extended 

 from north of Descanso Bay, Baja California (line 97) to the area 

 off Cape San Lucas, Baja California (line 153) , seaward to 

 station 60 on about half of the southern end of the pattern (Fig. 

 11) . Plankton samples collected from this cruise were processed 

 by NMFS as standard CalCOFI samples, and the resulting 

 ichthyoplankton data were included in the CalCOFI data base. 

 Summary reports for this cruise are published in Univ. of Calif., 

 SIO (1967) . 



SAMPLING GEAR AND METHODS 



The standard CalCOFI net used from 1949 to 1969 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. The net ring was fastened to a short 3-lead 



CalCOFI lines (Figure 13) 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 4 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 Kramer et al., 1972 for further details). 



