4 0-57) was covered on all cruises except those in January and 

 March. Coverage off central California (lines 60-77) was more 

 consistent with all major lines occupied except in cruises 7205 

 and 7210 during which only two cardinal lines were surveyed. The 

 area between Pt. Conception, California and Pt. San Juanico, Baja 

 California (lines 80-137) was surveyed on all cruises (only 

 cardinal lines were occupied in cruises 7205 and 7210) . The area 

 off southern Baja California (lines 140-157) was surveyed on 

 three cruises (7202, 7205, 7210). Coverage extended seaward to 

 station 140 (approximately 400-500 miles offshore) on a few lines 

 in cruises 7205 and 7210, but typically did not extend beyond 

 station 90 (approximately 160-260 miles offshore) on other 

 cruises. 



Four vessels were employed on these cruises: the David 

 Starr Jordan of NMFS , the Alexander Agassi z of SIO, the Alaska of 

 CDFG, and the Alba of the Soviet Union. Two to four vessels 

 participated on each cruise with the David Starr Jordan and 

 Alexander Agassi z being used on all six (Table 1 ; Univ. of 

 Calif., SIO, 1980, 1982, 1985). 



After 1969, CalCOFI surveys were made on a triennial basis. 

 These began in 1972 and continued every 3 years (1975, 1978, 

 1981, 1984) until 1985 when annual surveys were resumed. 



SAMPLING GEAR AND METHODS 



During 1972, a 1-m diameter ring net was used on all 

 cruises; the net was similar to that used on previous surveys 

 except the fabric was 0.505 mm nylon mesh instead of silk bolting 

 cloth (Smith, 1974). The cod end was constructed of 0.333 mm 

 nylon mesh. The frame was fastened to a short 3-lead bridle 

 connected to several meters of line which attached to the towing 

 cable by a clamp. A current meter was suspended in the center of 

 the mouth of each net to measure volume of water filtered (see 

 Kramer et al., 1972, for further details). 



CalCOFI lines (Figure 9) 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 2 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). 



