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

 4 0-57) was not routinely surveyed; this area was only partially 

 covered on three cruises in April, June, and July. The area off 

 central California (lines 60-77) was surveyed on seven cruises: 

 January, March through July, and October. The area between Pt. 

 Conception, California and Pt. San Juanico, Baja California 

 (lines 80-137) was surveyed monthly. In September coverage north 

 of line 110 was limited to two lines in the southern California 

 Bight and in November and December there was no coverage south of 

 line 100. The area off southern Baja California (lines 140-157) 

 was surveyed in January, February, March, and October. Coverage 

 extended seaward to station 145 (ca. 400-500 miles offshore) on 

 lines 80-100 during April, but typically did not extend beyond 

 station 90 (ca. 160-250 miles offshore) . Offshore coverage was 

 greatest between January and July and generally diminished during 

 later cruises. 



Six vessels were employed on these cruises: the Black 

 Douglas of NMFS, and the Horizon, Orca , Paolina T., Spencer F. 

 Baird , and the Stranger of SIO. One to four vessels participated 

 on each cruise, with cruises in April, July, and October 

 employing the maximum of four vessel. The Black Douglas was used 

 on all cruises except February, November, and December. The 

 Stranger participated in 8 cruises (January-July, October) and 

 the Paolina T participated in 7 cruises. The other 3 vessels 

 were used on a total of 6 cruises (Thrailkill, 1961) . 



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. On parts of 3 cruises during 1958 (5804, 5805, 

 5807) the standard net was replaced with one constructed of 

 nylon. Construction of the nets was similar; however, the nylon 



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 Kramer et al., 1972 for further details). 



