Figure 5.--Traversing microscope used for examining Recorder gauzes. 



sections exposed. The track charts were then 

 completed showing locations where individual 

 gauze sections were exposed in recorders both 

 at the surface and at 10 meters (figs. 6-11). 

 Tables 2, 3, and 4 give date, time, and position 

 for reference gauze sections. The section equiv- 

 alent varied slightly with individual recorders 

 and among distances covered (see tables 11-13). 

 Because the section equivalent varied, the 

 number of eggs and larvae were converted to 

 numbers per 5 miles of tow. 



Throughout our work we use numbers per 5 

 miles of tow as a unit of abundance. In this dis- 

 tance at normal towing speeds, the recorder 

 with a l/2-inch square opening will theoretically 

 filter 0.30 cubic meters of water per mile. To 

 convert numbers per miles to numbers per cubic 

 meter, it is necessary to multiply by a factor 

 of 0.66. 



All numbers listed in tables 8-10 have been 

 converted to numbers per 5 miles of tow and 

 rounded to the nearest whole number. 



It will be realized, from the tables 8-10, that 

 the numbers of eggs and larvae in individual 

 samples were very low. Experience has shown, 



however, that the samples provide excellent 

 material for quantitative studies of distribu- 

 tion and of fluctuations in abundance. This has 

 been demonstrated by Colton, Honey, and 

 Temple (1961), Colton and Marak (in press), 

 Colton and Temple (1961), and Henderson 

 (1954). 



Temperature and Salinity 



Only surface temperatures were used in 

 the graphic presentation in this report as they 

 were generally found to be indicative of tem- 

 peratures in the depth of water studied, 10 

 meters to surface. Observed temperatures 

 were rounded to the nearest whole °F., and 

 salinity values were rounded to nearest 0.5 °/oo 

 (figs. 1, 2, 3, 12, 13, and 14). Actual tempera- 

 ture and salinity figures may be found in tables 

 2, 3, and 4. 



Drift Bottles 



A detailed analysis of the data obtained from 

 the drift bottles released on these cruises dur- 

 ing the spring of 1953 has been reported by 

 Day (1958), 



