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Table 1

Water quality parameters obtained over 5 days of operation for each daily fish food dosage (temperature of water samples was 26.0 ± 2.6 °C). The paired sample t-test was used to determine p-values

Dosage (g/day)ParameterInfluent water (R)Supernatant water (S)Filtered water (F)Statistically significant difference (SS) when p-value < α = 0.05
R compared to SS compared to F
0.10 Turbidity (NTU) 8.2 ± 3.2 8.5 ± 2.5 3.0 ± 0.8 p = 0.626 p = 0.000 SS 
Apparent colour (mg Pt-Co/L) 9.4 ± 4.5 9.8 ± 3.9 3.0 ± 1.8 p = 0.456 p = 0.000 SS 
Electrical conductivity (μS/cm) 51.9 ± 1.2 50.8 ± 0.8 51.2 ± 1.0 p = 0.024 SS p = 0.755 
Nitrate (μg/L) 125.8 ± 16.1 135.6 ± 25.1 128 ± 66 p = 0.209 p = 0.472 
pH 7.1 ± 0.4 6.9 ± 0.6 7.6 ± 0.1 p = 0.503 p = 0.068 
0.25 Turbidity (NTU) 11.2 ± 1.0 11.4 ± 1.3 2.7 ± 0.5 p = 0.089 p = 0.000 SS 
Apparent colour (mg Pt-Co/L) 20.2 ± 7.6 20.4 ± 6.4 4.2 ± 1.4 p = 0.689 p = 0.000 SS 
Electrical conductivity (μS/cm) 49.2 ± 2.0 50.4 ± 2.3 52.8 ± 1.0 p = 0.141 p = 0.152 
Nitrate (μg/L) 101.3 ± 56.1 80 ± 56 163 ± 82 p = 0.647 p = 0.114 
pH 7.0 ± 0.2 7.2 ± 0.3 7.7 ± 0.1 p = 0.005 SS p = 0.001 SS 
0.50 Turbidity (NTU) 16.1 ± 4.6 15.2 ± 5.0 4.7 ± 2.3 p = 0.083 p = 0.000 SS 
Apparent colour (mg Pt-Co/L) 24.9 ± 2.5 23.4 ± 3.5 5.8 ± 3.2 p = 0.026 SS p = 0.000 SS 
Electrical conductivity (μS/cm) 50.0 ± 1.0 48.0 ± 1.9 49.7 ± 1.9 p = 0.052 p = 0.090 
Nitrate (μg/L) 302 ± 44 282 ± 62 136 ± 71 p = 0.173 p = 0.000 SS 
pH 7.0 ± 0.2 7.4 ± 0.3 7.7 ± 0.2 p = 0.034 SS p = 0.049 SS 
Dosage (g/day)ParameterInfluent water (R)Supernatant water (S)Filtered water (F)Statistically significant difference (SS) when p-value < α = 0.05
R compared to SS compared to F
0.10 Turbidity (NTU) 8.2 ± 3.2 8.5 ± 2.5 3.0 ± 0.8 p = 0.626 p = 0.000 SS 
Apparent colour (mg Pt-Co/L) 9.4 ± 4.5 9.8 ± 3.9 3.0 ± 1.8 p = 0.456 p = 0.000 SS 
Electrical conductivity (μS/cm) 51.9 ± 1.2 50.8 ± 0.8 51.2 ± 1.0 p = 0.024 SS p = 0.755 
Nitrate (μg/L) 125.8 ± 16.1 135.6 ± 25.1 128 ± 66 p = 0.209 p = 0.472 
pH 7.1 ± 0.4 6.9 ± 0.6 7.6 ± 0.1 p = 0.503 p = 0.068 
0.25 Turbidity (NTU) 11.2 ± 1.0 11.4 ± 1.3 2.7 ± 0.5 p = 0.089 p = 0.000 SS 
Apparent colour (mg Pt-Co/L) 20.2 ± 7.6 20.4 ± 6.4 4.2 ± 1.4 p = 0.689 p = 0.000 SS 
Electrical conductivity (μS/cm) 49.2 ± 2.0 50.4 ± 2.3 52.8 ± 1.0 p = 0.141 p = 0.152 
Nitrate (μg/L) 101.3 ± 56.1 80 ± 56 163 ± 82 p = 0.647 p = 0.114 
pH 7.0 ± 0.2 7.2 ± 0.3 7.7 ± 0.1 p = 0.005 SS p = 0.001 SS 
0.50 Turbidity (NTU) 16.1 ± 4.6 15.2 ± 5.0 4.7 ± 2.3 p = 0.083 p = 0.000 SS 
Apparent colour (mg Pt-Co/L) 24.9 ± 2.5 23.4 ± 3.5 5.8 ± 3.2 p = 0.026 SS p = 0.000 SS 
Electrical conductivity (μS/cm) 50.0 ± 1.0 48.0 ± 1.9 49.7 ± 1.9 p = 0.052 p = 0.090 
Nitrate (μg/L) 302 ± 44 282 ± 62 136 ± 71 p = 0.173 p = 0.000 SS 
pH 7.0 ± 0.2 7.4 ± 0.3 7.7 ± 0.2 p = 0.034 SS p = 0.049 SS 
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