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. 2018 Oct 18;9:2457. doi: 10.3389/fmicb.2018.02457

Table 1.

Physical parameters, in-organic nutrient concentrations, and cultivable heterotrophic bacteria abundances over 70 rearing days in the semi-intensive and intensive farming system.

Day 10
20
30
40
50
60
70
Systema S T S T S T S T S T S T S T
Parametersb
SPM (mg L-1) 66.6 ±
8.0a
68.7 ±
5.2a
68.1 ±
4.9a
70.3 ±
7.7a
80.1 ±
12.2b
91.5 ±
8.3b
96.5 ±
5.7c
122.0 ±
22.2c
158.1 ±
4.0d
202.6 ±
18.5d
167.3 ±
5.5d
187.6 ±
11.0d
173.1 ±
2.2d
171.3 ±
17.7d
Chl a (mg L-1) 13.34 ±
7.13ac
5.47 ±
3.82a
14.61 ±
1.49ae
10.11 ±
5.04ab
11.22 ±
0.96ab
22.8 ±
19.8ae
18.5 ±
5.5ae
77.9 ±
32.1e
20.7 ±
9.1ae
63.5 ±
29.1ce
30.9 ±
32.3ae
33.7 ±
14.2bce
16.9 ±
14.9acd
68.1 ±
27.7de
pH 8.24 ±
0.04b
8.18 ±
0.11b
8.20 ±
0.14ab
7.95 ±
0.07ab
8.26 ±
0.22ab
7.9 ±
0.1ab
8.5 ±
0.1b
8.0 ±
0.1b
8.3 ±
0.2ab
7.6 ±
0.5ab
7.9 ±
0.1a
7.8 ±
0.1a
8.4 ±
0.5b
8.1 ±
0.1b
DO (mg L-1) 6.13 ±
0.14
6.32 ±
0.1
6.4 ±
0.02
6.36 ±
0.13
5.90 ±
0.65
6.2 ±
0.1
6.1 ±
0.2
6.9 ±
0.8
5.9 ±
0.3
6.1 ±
0.2
5.7 ±
0.1
6.3 ±
0.2
5.8 ±
0.5
6.2 ±
0.3
Salinity (PSU) 35.37 ±
0.15bd
38.43 ±
0.78d
35.20 ±
0.69ad
36.79 ±
0.50cd
32.44 ±
3.26a
35.9 ±
0.9bd
33.7 ±
0.7abc
35.0 ±
0.9abc
33.4 ±
0.3ab
35.8 ±
0.3bd
33.6 ±
1.4abc
34.1 ±
0.8abc
34.6 ±
0.9abc
33.6 ±
0.5ab
Temperature (°C) 31.24 ±
0.41cd
30.19 ±
0.50bcd
28.08 ±
0.64a
30.44 ±
0.18bcd
31.61 ±
0.98d
30.4 ±
1.6bcd
29.6 ±
0.2ac
28.9 ±
0.5ab
31.0 ±
0.1cd
30.1 ±
0.4bcd
30.8 ±
0.8cd
30.2 ±
0.1bcd
30.7 ±
0.5bcd
30.5 ±
0.4bcd
Turbidity (NTU) 16.53 ±
10.69ac
3.9 ±
2.21a
24.5 ±
8.67bc
9.93 ±
8.44ab
35.87 ±
30.26bc
22.9 ±
14.6bc
27.0 ±
10.5bc
25.7 ±
2.7bc
25.9 ±
12.9bc
25.3 ±
5.6bc
27.6 ±
7.2bc
30.2 ±
14.4c
26.9 ±
9.2bc
35.7 ±
15.9c
Cultivable Bact. (log10 CFU mL-1)
THB 4.75 ±
0.06ac
4.42 ±
0.15a
5.35 ±
0.04bcd
4.65 ±
0.30ab
6.29 ±
0.15ef
5.50 ±
0.16cd
5.99 ±
0.50de
6.76 ±
0.20eg
6.87 ±
0.69fg
7.44 ±
0.19g
7.53 ±
0.19g
7.41 ±
0.36g
7.47 ±
0.18g
7.4 ±
0.1g
TPPV 2.03 ±
0.56a
2.13 ±
0.90a
4.35 ±
0.36bc
3.32 ±
0.32ab
4.51 ±
0.19bc
3.98 ±
0.18b
3.85 ±
0.29b
3.73 ±
0.41b
3.85 ±
0.48b
3.72 ±
0.15b
4.16 ±
0.69bc
5.41 ±
0.89c
4.18 ±
0.42bc
4.36 ±
0.7bc
Nutrient (mg L-1)
NH4+ 0.60 ±
0.37
0.436 ±
0.671
0.46 ±
0.71
0.15 ±
0.08
0.31 ±
0.23
0.26 ±
0.34
0.23 ±
0.19
0.26 ±
0.22
0.50 ±
0.07
0.37 ±
0.30
0.61 ±
0.858
0.835 ±
0.248
0.33 ±
0.34
0.36 ±
0.25
NO2- 0.004 ±
0.004
0.183 ±
0.292
0.004 ±
0.004
0.008 ±
0.007
0.021 ±
0.025
0.005 ±
0.003
0.007 ±
0.007
0.201 ±
0.334
0.016 ±
0.006
0.001 ±
0.001
0.002 ±
0.001
0.079 ±
0.113
0.013 ±
0.009
0.004 ±
0.003
NO3- 0.048 ±
0.06
0.075 ±
0.11
0.007 ±
0.005
0.097 ±
0.16
0.004 ±
0.003
0.027 ±
0.042
0.028 ±
0.02
0.213 ±
0.184
0.034 ±
0.025
0.014 ±
0.013
0.052 ±
0.04
0.307 ±
0.456
0.028 ±
0.026
0.284 ±
0.484
PO43- 0.33 ±
0.31
0.53 ±
0.41
0.29 ±
0.20
0.50 ±
0.37
0.22 ±
0.17
0.22 ±
0.27
0.31 ±
0.38
0.72 ±
0.07
0.39 ±
0.26
0.11 ±
0.12
0.35 ±
0.36
0.59 ±
0.47
0.61 ±
0.08
0.31 ±
0.22
SiO44- 1.424 ±
1.453
0.206 ±
0.191
0.179 ±
0.047
0.315 ±
0.253
1.217 ±
0.918
0.343 ±
0.134
0.565 ±
0.576
0.324 ±
0.245
0.898 ±
1.193
0.45 ±
0.36
0.636 ±
0.792
0.11 ±
0.07
0.623 ±
0.668
1.157 ±
1.413

Significant differences between systems at a significance threshold of 0.05 are indicated by asterisks; superscript letters indicate significant differences for the interaction system and day (p < 0.05). Data are shown as mean ± standard deviation. aS, semi-intensive system; T, intensive system. bSPM, suspended particulate matter; Chl a, chlorophyll a; THB, total heterotrophic bacteria; TPPV, total potential pathogenic bacteria.