3.3. Study 2 water quality and BOD
The selected pond at each farm was drained on average after a
104-d culture period. Mean TAN and chlorophyll a concentrations
were 0.05 mg L−1and 102.1 mg m−3, respectively (Table 5). Mean
coefficient of variation for measured DO concentrations for replicate
samples at each time period was low and averaged 3.1%. The meanBOD5was 10.4 mg L−1and the mean BOD and UBOD were 37.1 and36.7 mg L−1, respectively. The BOD 5:BOD90ratio averaged 0.29. The
decomposition rate constant averaged 0.054 d
90
−1
. There was a linear
relationship between computed UBOD and BOD
5
(R
2
=0.671) in pond
water.