Environmental Engineering Reference
In-Depth Information
Table 5.5 Monthly variation of body weight (gm) in Macrobrachium rosenbergii
in the selected ponds
Month
Control
Pond 1 (0.5 ppm)
Pond 2 (1.5 ppm)
Pond 3 (2.5 ppm)
1
3.21
3.18
5.42
3.30
2
8.00
5.29
16.60
10.20
3
16.89
16.57
21.98
17.12
4
20.49
23.16
33.83
26.98
5
32.94
34.72
46.55
38.53
6
41.03
45.94
58.22
51.32
7
52.55
57.04
69.92
62.95
8
61.76
66.17
80.48
72.04
Figures in bracket indicate the applied doses of ferrous sulphate in the pond water
with sea water, becoming virtually undetectable
after a few days. Researchers therefore have to
add minute amounts of an inert tracer like sul-
phur hexa
holding and sequestering carbon. The merits of
the programme are as follows:
1. The question of huge input of iron does not
arise because the water body has a limited
surface area or volume.
2. Standardization of iron fertilization can be
easily done because of the closed nature of the
system due to which the wave action, tidal
phenomenon and other parameters can be
controlled.
uoride (SF 6 ), which itself is a potent
greenhouse gas. One kilogram of SF 6 added in
an experiment is equivalent to releasing 7 ton-
nes of carbon dioxide.
Considering the drawbacks of iron fertiliza-
tion in open ocean, a case study was undertaken
to
fl
nd the potentiality of aquacultural ponds in
Fig. 5.13 Freshwater prawn production from iron-fertilized pond
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