Table 1 Parameters of embryonic development of Sparicotyle chrysophrii by environmental factor
Environmental factor | Factor level | Incubation period (h) | Hatching period (h) | Hatching peaka (h) | Hatching success (%) |
|---|---|---|---|---|---|
Mean ± SD (Range) | |||||
Temperature (± 0.1 °C) | 10 | 995.5 ± 23.6 (948–1044)b | 96b | 988b | 7.3c |
14 | 253.4 ± 17.3 (212–332) | 120 | 248 | 91.0 | |
18 | 178.1 ± 14.8 (148–256) | 108 | 176 | 93.3 | |
22 | 143.1 ± 22.5 (116–200) | 84 | 124 | 93.7 | |
26 | 128.0 ± 12.0 (116–172) | 56 | 124 | 77.3 | |
30 | 148.8 ± 20.8 (124–184) | 60 | 148 | 6.0 | |
pH (± 0.1) | 7.0 | 150.0 ± 9.0 (144–176) | 32 | 144/148 | 56.0 |
7.9 | 143.1 ± 22.5 (116–200) | 84 | 124 | 93.7 | |
Light regime (light:darkness) | 12:12 | 147.4 ± 25.6 (120–200) | 80 | 124 | 93.0 |
0:24 | 125.1 ± 11.3 (112–232) | 120 | 124 | 89.3 | |
24:0 | 141.4 ± 23.4 (108–268) | 160 | 140 | 88.0 | |
Salinity(ppt)-Temperature (± 0.1 °C) | 27−18 | 191.7 ± 13.6 (152–220) | 68 | 196 | 89.3 |
36−18 | 169.6 ± 15.3 (140–268) | 128 | 168 | 85.3 | |
37−18 | 172.7 ± 18.2 (140–228) | 88 | 172 | 64.7 | |
38−18 | 179.5 ± 12.7 (168–220) | 52 | 168 | 80.7 | |
47−18 | 218.7 ± 11.5 (180–244) | 64 | 220 | 74.6 | |
27−22 | 141.8 ± 11.5 (120–168) | 148 | 148 | 85.3 | |
36−22 | 129.2 ± 9.3 (108–156) | 48 | 124 | 74.7 | |
37−22 | 138.3 ± 16.3 (124–196) | 72 | 128 | 82.0 | |
38−22 | 135.0 ± 16.7 (124–228) | 104 | 128 | 69.0 | |
47−22 | 182.2 ± 12.7 (148–204) | 56 | 176 | 64.7 |