coverage off central California (lines 60-77) was limited to 

 cruises in May, June, July, and November. The area between Pt. 

 Conception, California and Cape San Lucas, Baja California (lines 

 80-157) was surveyed during three cruises: February, April, and 

 June, with the cruise in March ending at line 150. Cruises in 

 January, August, and September were limited to waters off Baja 

 California, while cruises in November and December were primarily 

 confined to waters off southern California. Coverage extended 

 seaward to station 90 (approximately 160-250 miles offshore) on 

 most cruises except during August, September, November, and 

 December when mostly nearshore stations were surveyed. 



Six vessels were employed on these cruises: the Black 

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

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

 each cruise, with cruises in May, June, and July employing the 

 maximum of four ships. The Black Douglas participated in 7 

 cruises and the Orca and Stranger in 6 cruises; the other 3 ships 

 participated in a total of 8 cruises (Ahlstrom, 1959) . 



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 4 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 10 cruises during 1957 (5701-5707; 

 5709-5711) the standard net was replaced with one constructed of 

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

 nets had mesh sizes of 0.471 mm for the net body and 0.280 mm for 

 the end of the cone and the cod end (Smith, 1971) . The net ring 

 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 net mouth to measure 

 volume of water filtered (see Kramer et al., 1972, for further 

 details) . 



1 CalC0FI 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). 



