TABLE 1. — The estimated average numbers of copepods escaping through the bucket screen per 6.5- 

 mlnute sampling interval in 1961 compared to the average numbers in the collecting bucket per 

 sampling interval in 1958 



Copepod length 



Average escaping per interval ■"" 



Average accumulated 

 per interval^ 



Escapement 



Mm. 



<0.2 



0.2 - 0.5. 

 0.5 - 1.0. 



Numbei 



71 



31 



2 



Number 



2,266 

 612 



Percent 



1.3 



0.3 



^ From 5 sampling intervals taken at various times during 1961 surveys by collecting all the 

 water filtering through the bucket screen after removal of the friction cap at the end of each 

 interval. 



^ From 129 sampling intervals taken on two grid patterns in the fall of 1958 in the same manner 

 but with a different arrangement of hose and pump. 



< 



Of 



o 

 u. 

 o 

 q; 



HI 



CQ 



S 

 ZD 



100 



200 



300 400 500 



LENGTH IN MICRONS 



600 



Figure 12. --The average length frequency distribution of copepods escaping through the bucket screen per 

 6.5 -minute sample interval. The light shading denotes nauplii and the hea\'y shading denotes copepodites. 

 No adult copepods were found in the escapement samples. 



15 



