Mean values of the water parameters of the fish

Rice paddies	Temperature (°C)	Dissolved oxygen (µgl^-1)	pH	NH₄-N (µgl^-1)	NO₃-N (µgl^-1)	PO₄-P (µgl^-1)	Water depth (m)
Paddy 1	25.4 ± 0.81 ^a	10.02 ± 1.14^a	6.9 ± 0.22^a	< 0.1^a	1.33 ± 0.52	< 0.5^a	0.75
Paddy 2	24.8 ± 0.73 ^a	9.3 ± 1.16^a	7 ± 0.10^a	< 0.1^a	1.5 ± 0.55	< 0.5^a	0.8
Paddy 3	25.5 ± 0.92 ^a	10.64 ± 0.52^b	7.2 ± 0.3^a	< 0.1^a	1.5 ± 0.54	< 0.5^a	0.52
Paddy 4	25.6 ± 0.71 ^a	9.02 ± 0.86^b	6.9 ± 0.23^a	< 0.1^a	1.5 ± 0.55^a	< 0.5^a	0.65

Where values with a were not significantly different and those with b were significantly different at p = 0.05.

Table 1: Mean values of the water parameters of the fish refugia in the rice paddies from 12 March to 9 August 2009.

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