1) . The area off northern California (lines 40-57) was not 

 surveyed. Central California (lines 60-77) waters were covered 

 by stations occupied in May, June, July, and October. The area 

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

 California (lines 80-137) was surveyed on all cruises. The area 

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

 January, February, March, and December. Coverage extended 

 seaward to station 100 (approximately 3 00 miles offshore) on some 

 lines in the main sampling area but typically did not extend 

 beyond station 90 (approximately 160-250 miles offshore) . 



Six vessels were employed on these cruises: the Black 

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

 Baird and Stranger of SIO. Two to three vessels participated on 

 each cruise with three being the usual number. The Crest was 

 used on all cruises except 5510 and 5512 and the Black Douglas on 

 all but 5501, 5502, and 5506. The other four vessels 

 participated on a total of 10 cruises (Reid et al., 1962). 



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 30xxx 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 

 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). 



The standard tow from 1951 through 1968 was an oblique haul 

 to 140 m depth (to 15 m of the bottom in shallow areas) designed 

 to filter a constant amount of water per depth interval (ca. 

 3m 3 /m of depth) over the vertical range of most ichthyoplankters. 

 Hauls were made at a ship speed of 1.5-2.0 knots and initiated by 



1 CalC0FI lines (Figure 11) 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). 



