| Naga
- The *ICLARM Quarterly
Vol.
23, No. 4 (October - December 2000)
Aquabyte
Physico-Chemical
Factors and Bacteria in Fish Ponds
X. Jun, F. Xiuzheng
and Y. Tongbing
Abstract
Analyses of pond water and mud samples show that
nitrifying bacteria (including ammonifying bacteria,
nitrite bacteria, nitrobacteria and denitrifying
bacteria) are in general closely correlated with
various physico-chemical factors; ammonifying
bacteria are mainly correlated with dissolved
oxygen; denitrifying bacteria are inversely correlated
with phosphorus; nitrite bacteria are closely
correlated with nitrites, nitrobacteria are inversely
correlated with ammoniac nitrogen. The nitrifying
bacteria are more closely correlated with heterotrophic
bacteria. Nitrobacteria are inversely correlated
with anaerobic heterotrophic bacteria. The correlation
is quite weak between all the nitrite bacteria
which indicates that the nitrite bacteria have
a controlling and regulating function in water
quality and there is no interdependence as each
plays a role of its own. The paper also discusses
how the superficial soil (pond mud down to 3.5
cm deep) and different layers of the mud affect
the biomass of bacteria. The study shows that
the top superficial layer (down to 1.5 cm deep)
is the major area for decomposing and converting
organic matter.
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Article (PDF 58 KB)
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