Water qualify
289
Table 2.
Average gains and losses in kilograms for nitrogen, phosphorus,
and dissolved oxygen in three channel catfish ponds (405 m2 each).
Item
Nitrogen
Ph05phorus
Oxygen
Gains
Fish stock
0.12
0.036
Feed
11.15
1.682
Nitrogen fixation
?
Photosynthesis
413.1
Inflow
0.81
0.036
9.4
Aeration
9.9
Net,diffusion
104.8
Total
12.08
1.754
537.2
Losses
Fish harvest
2.99
0.521
Outflow
2.07
0.264
3.2
Respiration in water column
309.3
Benthic respiration
103.8
Fish respiration
120.9
Denitrification and
diffusion of ammonia
6.92
Uptake by mud
0.969
Total
12.08
1.754
537.2
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