Table 29. — Limnological observations in the upper Mississippi River. 
422 
BULLETIN OF THE BUREAU OF FISHERIES. 
Current very 
swift and 
irregular. 
•sMjgui oiqno ‘jSonejedsuejx 
i & : : i 3 
20 
27 
33 
46 
27 
3 
8 j i : 
Current 
velocity 
per second. 
'1935 
• S i i ^ j i : : 
j™ ^ “ i i 1° ^ i 
TTT: 
•SJ8X0H 
i s j j |8 a j j p i i 
.39 
.42 
.24 
Number of 
Cladocera 
per cubic 
meter. 
0 S i : j° j j 
•ejduiBS qaeg 
o ooooo ooooooo 
00 ° SH8° 88 
I 
OOOO 
Number of 
Copepoda 
per cubic 
meter. 
•UBayt 
° : : j® j : : : : 
5 s j ; i° j j 
O . • 
■eidmcs t[OBg; 
O OOOOO OOOOOOO 
00 § gg§§° 00 
OOOO 
V olume of plankton, 
cubic centimeters 
per cubic meter. 
•^an IBOIXJ0A 
5 
Pump. 
Centrifuge 
method. 
*a§e 
-jaAy 
"nr § m p m 
"V : : : : : : 
0 : : : 
■ejduiBS 
Hoca 
4 
6 
4 
; 
5 
3 
5 
36 
32 
22 
16 
•poqiem Surmes 
12 
4 
2 
Mud. 
12 
2 
SSS88 
Tempera- 
ture of 
water. 
O 
31.1. 
30. 55 
30. 23 
30.23 
30.23 
32.22 
31. 11 
31. 11 
31. 11 
31.03 
31. 11 
31.23 
31.19 
33. 33 
33.53 
33. 33 
31. 11 
31. 11 
30.63 
30. 58 
30. 43 
33. 33 
32 ! 0 
31.1 
31.0 
31.0 
31.0 
28.9 
28! 6 
28.6 
•sreiem ‘qided 
O 0 10 0 10 O OOOOCOOOOOO O O 0*0000 0*0 0010000*000 
Character 
of 
bottom. 
Mud 
...do 
...do 
...do 
...do 
Sand . . 
Sand and 
gravel. 
Mud 
...do 
...do 
...do 
...do 
•srexetn ‘rndea 
1.0 
4.6 
.25 
2.1 
.6 
.6 
5.2 
.3 
3.0 
4.6 
4.6 
Time of 
day. 
3-5 p. m. . 
9-11 a. m. 
9- 10 a. m. 
10- 11 a. m 
11- 12 a. m 
3- 4 p.m.. 
4^5 p.m.. 
1.30- 2 p.m 
9.30- 10 a.m 
11.30- 12 . . . 
2-3.30 p.m. 
4- 5 p. m... 
9.30- 11 a.m 
Date. 
July 11 
July 12 
July 13 
...do 
...do 
An 
...do 
July 14 
July 15 
...do 
...do 
...do 
July 20 
•S8|pn ‘xeUTTBip 
-ratals Aq incj -^S nrojj 0 ontqsi<l 
| ^ 3 3 3 £ 
^ o' u? w lo w 0 ? 
4 r^4 JO LOJOIO T}4 
Station number and location. 
1. Mississippi River near Fairport, 
Iowa, Andalusia Slough. 
2. Mississippi River near Fairport, 
Iowa, main channel. 
3. Mississippi River near New Boston, 
111., Sturgeon Bay. 
4. Mississippi River near New Boston, 
111., mam channel (near left shore). 
5. Mississippi River near New Boston, 
111., midstream. 
6. The mouth of the Edwards River, 
near New Boston, 111. 
7. Mississippi River near New Boston, 
111., 1 mile below the mouth 01 
Edwards River, mid river. 
8. Mississippi River, 1 mile above 
Burlington, Iowa, main channel. 
9. Lake Keokuk, near Dallas City, 111., 
between Dallas Island and right 
shore, midstream. 
10. Lake Keokuk, near Dallas City, 111., 
between Dallas Island and right 
shore, near the shore. 
11. Lake Keokuk, between Dallas Is- 
land and left shore. 
12. Lake Keokuk, 1 mile above Dallas 
City, 111., Dallas Chute. 
13. 5| miles above Dallas City, 111., the 
slough of the Skunk River. 
