however, only the first month of occupancy is used to identify 

 cruises in the ichthyoplankton data base and reports. 



Stations off northern California (lines 40-57) were not 

 occupied in 1961. The area off central California (lines 60-77) 

 was surveyed on all cruises. The area between Pt. Conception, 

 California and Pt. San Juanico, Baja California (lines 80-137) 

 was surveyed on all cruises and on Cruise 6110 coverage extended 

 south to line 140. Offshore coverage was more extensive than 

 during previous monthly surveys with station lines extending 

 seaward to station 200 on lines 60, 70, 80, and 90 on all 

 cruises, a distance of approximately 600-700 miles offshore . 

 Typically, coverage on other lines extended to station 90 (ca. 

 160-260 miles offshore) or station 120 (ca. 270-360 miles 

 offshore) . 



Three vessels were employed on these cruises: the Black 

 Douglas and Hugh M. Smith of NMFS and the Horizon of SIO. The 

 Black Douglas and Horizon were used on all cruises, and the Hugh 

 M. Smith was used on one cruise (Univ. of Calif., SIO, 1961, 

 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 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. 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 



CalCOFI lines (Figure 7) 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). 



