1920] 



Alien: Plankton- of the San Joaquin River 



187 



Table 1. — Organisms Per Cubic Meter in Plankton of 

 Stockton Channel in 1913 — (Continued) 



Filinia 



1913 egg, free 



11/22 1S5.136 



11/26 



11/30 105,792 



12/ 3 52,896 



12/ 6 



12/10 



12/14 19,836 



12/17 



12/20 



12/24 



12/27 



12/31 



1913 



1/ 5 

 1/ 8 

 1/12 

 1/15 

 1/19 

 1/22 

 1/26 

 1/29 

 2/ 2 

 2/ 5 

 2/ 8 

 2/12 

 2/15 

 2/19 

 2/23 

 2/26 

 3/ 1 

 3/ 5 

 3/ 8 

 3/12 

 3/15 

 3/19 

 3/23 

 3/26 

 3/29 

 4/ 2 

 4/ 5 

 4/ 9 

 4/13 

 4/16 

 4/19 

 4/23 

 4/26 

 4/30 

 5/ 3 

 5/ 7 

 5/11 

 5/14 

 5/17 

 5/21 

 5/24 

 5/27 

 5/31 

 6/ 3 



Keratella 

 quadra t.a 



1,600 



Lecane 



48,000 



51,200 



52,896 



57,600 



3,200 



1,600 



S00 



1,600 



1,600 



26,448 



92,568 



79,344 



152,076 



85,956 



39,672 



231,420 



323,928 



198,360 



125,628 



423,168 



1,124,040 



11,200 



79,344 



251,256 1,600 



132,240 



16,000 



41,600 1,600 



925,680 



317,376 



343,824 



952,128 



740,544 



1,084,368 



2,142.288 



3,385,344 



4,205,232 



3,041,520 



925,680 



1,719,120 



4,205,232 



2,195,184 



2,459,664 



2,010,048 



1,613,328 



3,067,968 



5,104,464 



2,909,280 



1,005,024 



1,322,400 



317,376 



740,544 



846,336 



1,533,984 



400 



SI HI 



3,200 



3,200 



3,200 



Keratella 

 egg, attached 



22,400 



2N.SOO 



19,200 

 52,896 

 52,896 

 6,400 

 72,732 

 4,000 

 l(i,2s| 

 13,224 

 26.44S 

 66,120 



6,400 



Keratella 

 egg, free 



423.16S 



79,344 



105,792 



52,896 



52,896 



46,284 



1,600 

 19,836 

 19,836 

 39,672 

 79,344 



Polyarthra trigla 

 Polyarthra egg, attached 



trigla female 



1,200 



39,672 



800 



800 



19,836 



66,120 



1,600 



19,836 



105,792 



39,672 



4,800 



14,400 



105,792 



28.S00 



79,344 



370,272 



581,856 



158,688 



238,032 



132,240 



25,600 



79,344 



105,792 



158,688 



396,720 



1,110,816 



1,560,432 



766,992 



1,772,016 



370,272 



2,644,800 



2,062,944 



1,216,608 



3,147,312 



2,724,144 



528,960 



264,480 



57,111)1) 



38,400 



19,200 



19,200 



105,792 



3,200 



3,200 



52, S()(l 

 1,600 



52J896 



158,688 

 290.92S 

 1,600 

 555.40S 

 15S.68S 

 132,240 

 528,960 

 238,032 

 105,792 

 ls.-,,i;!ii 



