The Effect of UV Irradiation on Rearing Water Quality, Growth, and Survival of European Lobster (Homarus gammarus, L.) Larvae

Table 4

Water quality characteristics in the rearing tanks exposed to UVC irradiation (UV) or unexposed (CTRL). Values are given as mean ± 1 SEM over 7–15 days poststocking.

	CTRL	UV	N	Statistics
Total cells (×10^6 cells·mL^−1)	3.53 ± 0.65	1.70 ± 0.25	9	t (16.0) = 2.625,
Live cells (×10^6 cells·mL^−1)	1.81 ± 0.23	0.76 ± 0.12	9	t(12.2) = 4.116 ,
Proportion of dead cells (%)	43.66 ± 5.00	54.41 ± 3.24	9	t (16.0) = −1.807,
TAN (μg NH4-N L^−1)	239.53 ± 40.10	266.40 ± 30.71	15	t (28.0) = −0.532,
Nitrite (μg NO2-N L^−1)	17.60 ± 3.69	6.33 ± 0.53	15	t(14.6) = 3.019 ,
Nitrate (μg NO3-N L^−1)	271.47 ± 8.02	269.07 ± 7.08	15	t (28.0) = 0.224,
UVT (% transmission)	95.27 ± 0.54	95.17 ± 0.56	9	t (16.0) = 0.124,
Turbidity (NTU)	0.67 ± 0.07	1.11 ± 0.25	9	t (9.1) = −1.656,
Total COD (mgO2 L^−1)	11.85 ± 0.55	12.52 ± 0.19	6	t (10.0) = −1.158,
Dissolved COD (mgO2 L^−1)	10.43 ± 1.52	10.87 ± 0.50	6	t (10.0) = −0.276,
Total BOD5 (mgO2 L^−1)	0.56 ± 0.09	0.79 ± 0.14	6	t (10.0) = −1.432,

Rows in bold highlight statistical significance. NTU: Nephelometric turbidity unit.