San Juanico, Baja California (lines 80-137) was surveyed monthly, 

 except for September and November. Cruise 5310 began on line 82.3 

 and Cruise 5312 began on line 81.8 but on both cruises all lines 

 south to line 137 were covered. Cruises 5309 and 5311 were short 

 cruises covering the area south of Pt. Conception and, 

 additionally, the Sebastian Viscaino Bay region on 5311. The 

 area off southern Baja California (lines 140-150) was surveyed 

 only in January. Coverage extended seaward to station 160 on 

 lines 80 and 90 on Cruises 5304 and 5305 (approximately 450-500 

 miles offshore) but typically did not extend beyond station 90 

 (approximately 160-250 miles of f shore) . ■*• Coverage of the pattern 

 was heaviest from March through June and diminished during the 

 fall and winter. 



Six vessels were employed on these cruises: the Spencer F. 

 Baird , Crest, Horizon, Paolina T, and E. W. Scripps of SIO, and 

 the Yellowfin of CDFG. One to five vessels participated on each 

 cruise. The Crest was used on all cruises except 5311 (Ahlstrom, 

 1955) . 



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 

 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. 



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) . 



