PLANKTON PRODUCTION IN PISH PONDS 
171 
Table 1. — Dates in 1928 on which the C -ponds were fertilized and the kind and amount in pounds of 
fertilizer used 
Pond 
Fertilizer 
June 7 
June 16 
June 11 
August 
14 
August 
25 
Septem- 
ber 14 
Cl 
Superphosphate 
1 
1 
0 
H 
H 
0 
C 2 
Soybean meal 
3 
3 
1 
1 
1 
2 
C 3 
Shrimp bran 
3 
3 
1 
1 
1 
2 
C 4 
Control .. 
0 
0 
0 
0 
0 
0 
Table 2. — Quantities of free COi and phenol phthalein alkalinity in the C ponds in 1928 expressed in 
milligrams per liter of water. pH values are also given in this table 
Date and time 
Free CCh 
Alkalinity 
pH 
C 2 
C 3 
C 1 
C 2 
C 3 
C 4 
C 1 
C 2 
C 3 
C 4 
June 27, 8 a. m_ 
10. 10 
40. 46 
71.80 
8.08 
8.5 
8.9 
9. 1 
7. 7 
14. 16 
16. 18 
85. 94 
15. 16 
8.7 
8. 7 
9.3 
8. 65 
July 19, 8 a. m 
27. 70 
20. 22 
23. 42 
9. 10 
8.8 
8.7 
8.9 
8. 5 
0 
68. 76 
57. 62 
23. 26 
9.0 
9. 0 
8. 5 
8 8 
7. 58 
44. 50 
5. 06 
24. 26 
8.9 
7. 55 
8 0 
8 7 
Aug. 9, 3 p. m 
72.80 
23.24 
13. 14 
26.28 
9. 1 
8.7 
8.7 
8. 9 
6. 06 
35. 40 
1. 12 
32. 36 
8.8 
8.5 
7. 6 
8 75 
5. 56 
28. 32 
30. 34 
20. 22 
8. 85 
8.5 
8. 9 
8. 8 
Sept. 13, 1 p. m 
25. 28 
24. 26 
55. 60 
27. 30 
8.8 
8. 75 
9. 1 
8. 8 
Sept. 19, 12 m__ . 
21. 72 
15. 16 
65. 72 
45. 50 
8.9 
8.5 
9. 1 
9.05 
Table 3. — Amounts of chlorides and of dissolved oxygen in the C ponds in 1928 in milligrams per liter. 
Also the temperatures in degrees centigrade 
Chloride 
Dissolved oxygen 
Temper- 
ature all 
ponds 
Date 
C 1 
C 2 
C 3 
C 4 
C 1 
C 2 
C 3 
C 4 
3.0 
2.0 
21.0 
3.0 
4. 36 
3. 90 
3. 53 
6. 29 
18. 3 
July 7 
2.5 
3.0 
19.0 
3. 0 
3. 43 
2. 14 
3. 52 
3. 53 
25.0 
2.5 
2.5 
18.0 
3.5 
6. 62 
6. 76 
1. 66 
5. 79 
23.8 
July 30 
3.0 
2.5 
18.0 
2.0 
12. 21 
11.87 
6.91 
10. 80 
21. 1 
Aug. 9 - 
2. 5 
2.0 
16.0 
3.5 
8. 74 
2. 59 
3. 10 
6.41 
25.0 
Aug. 20 
2.5 
3.0 
16. 5 
3.0 
5. 53 
4. 55 
2. 30 
6. 51 
20. 5 
Aug. 30 
3.0 
3.0 
17.5 
3.0 
6. 85 
3.99 
5. 52 
6. 99 
19. 4 
Sept. 13 
3.0 
2.8 
17.0 
3.0 
6. 81 
6. 61 
7. 12 
7. 59 
20. 0 
Sept. 19 
4.5 
3.5 
21.0 
3.5 
10. 25 
8. 18 
9. 67 
n. 79 
20.0 
Table 4. — Organic matter in centrifuge plankton and nitrogen hi the C ponds in 1928. The results 
are stated in milligrams per liter of water 
Date 
Organic matter 
Organic nitrogen 
NH3 — nitrogen 
NO3 — nitrogen 
C 1 
C 2 
C 3 
C 4 
C 1 
C 2 
C 3 
C 4 
C 1 
C 2 
C 3 
C 4 
C 1 
C 2 
C 3 
C 4 
June 27. . 
3. 63 
44.64 
55.80 
2.51 
0. 992 
5. 02 
10. 08 
0.840 
0. 012 
0. 076 
0. 076 
0. 096 
0. 008 
0.045 
0. 023 
0. 009 
July 7 
1. 38 
26. 15 
11. 41 
1. 17 
. 608 
6. 04 
4.80 
.052 
.068 
.060 
.052 
.045 
. 055 
. 090 
. 035 
July 19 
1. 35 
21.81 
23. 30 
2. 45 
.760 
5. 48 
5. 73 
1. 00 
.052 
.052 
.068 
.040 
.017 
.045 
.045 
.022 
July 30.... 
3.69 
27. 99 
6. 98 
1.70 
1.60 
5. 80 
5. 08 
1.00 
.044 
. 144 
.088 
.028 
.029 
.035 
.036 
.019 
10. 70 
Aug. 9. .. 
6. 47 
5. 19 
4. 86 
1.76 
2.00 
2. 76 
3. 56 
.784 
.060 
. 600 
.072 
.028 
.020 
.032 
.032 
.018 
Aug. 20 
8. 02 
24. 74 
4. 33 
1.53 
1.88 
6. 43 
2. 76 
.240 
.048 
. 104 
.272 
.052 
.037 
.055 
.024 
.045 
Aug. 30... 
9. 86 
23. 34 
9. 80 
1.65 
1.66 
2. 24 
3.60 
.912 
.052 
.080 
.076 
. 044 
.035 
.040 
.050 
.033 
Sept. 13. . 
14. 43 
18.89 
5. 96 
1.50 
1.36 
3. 12 
2. 56 
.640 
.052 
.060 
.060 
.030 
.060 
.080 
.060 
.043 
Sept. 19-.. 
12. 75 
22. 02 
5. 75 
0. 56 
1. 64 
3. 04 
3. 52 
.928 
.052 
.060 
.076 
.020 
.080 
. 150 
. 120 
.095 
Av__ 
7. 22 
23. 86 
14.24 
1. 65 
1.304 
4. 43 
4. 40 
. 704 
.047 
. 127 
.094 
.044 
.036 
.059 
.053 
.035 
