Effects of a lagoon on performances of a freshwater fishpond in a multi-trophic aquaculture system

Open Access

Table 3

Means (and standard deviations (SD)) of physicochemical parameters of fishpond water recorded weekly (temperature, pH, DO: dissolved oxygen, %O₂: oxygen saturation, conductivity and turbidity) or monthly (TN: total nitrogen, TP: total phosphorus) from March-December.

Treatment	Semi-intensive coupled		Semi-intensive		Extensive

	Mean	SD	Mean	SD	Mean	SD	Significance¹
Temperature (°C)	16.9	5.6	16.7	5.8	17.6	6.3	NS
pH	7.9^a	0.5	8.0^b	0.5	8.3^c	0.8	^**
DO (mg.l⁻¹)	10.2^a	2.4	10.8^b	2.5	11.6^b	3.3	^**
%O₂ (%)	106^a	19	112^b	22	122^b	35	^**
Conductivity (mS.cm⁻¹)	308^a	67	304^a	41	336^b	70	^*
Turbidity (cm)	40^a	20	27^b	25	51^c	28	^**
TN (mg.l⁻¹)	1.79^a	0.92	2.77^b	1.57	1.38^c	0.72	^**
TP (mg.l⁻¹)	0.15^a	0.10	0.31^b	0.35	0.11^a	0.05	^**

¹Significance levels: **: p < 0.01, *: p < 0.05, NS: Not Significant. Means on the same line followed by the same letter do not differ significantly (p < 0.05).

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