Table 1. Cortisol release rates.
Cortisol response to 12 h overnight dark incubation, sham treatment, and UVB doses of 8, 16, and 32 kJ/m2. Cortisol release was analyzed in X. maculatus Jp 163 B, X. couchianus, and F1 hybrids produced from crossing these two parental line fish. In addition, cortisol release was assessed in wild type X. hellerii, and an albino X. hellerii. Absorbance values from cortisol readings were corrected for UVB degradation and normalized to fish standard length (Ls; mm) and duration of sampling (h) ±SEM. Wt =Wild Type. Alb = Albino. ND = Not Determined.
| Cortisol release rates (pg Ls−1h−1) | ||||||
|---|---|---|---|---|---|---|
| Female | Ls (mm) | 12 h dark | Sham | 8 kJ/m2 | 16 kJ/m2 | 32 kJ/m2 |
| X. maculatus | 28.5 ± 1.1 | 7.0 ± 1.5 | 7.1 ± 0.4 | 9.2 ± 0.4 | 22.2 ± 9.8 | 43.0 ± 9.8 |
| X. couchianus | 27.7 ± 0.5 | 39.1 ± 4.1 | 65.3 ± 38.8 | 72.6 ± 17.9 | 150.2 ± 55.2 | 76.0 ± 24.0 |
| F1 hybrid | 32.1 ± 0.9 | 35.3 ± 2.0 | 23.9 ± 4.7 | 12.3 ± 0.4 | 56.8 ± 6.2 | 135.8 ± 31.4 |
| Male | ||||||
| X. maculatus | 23.3 ± 1.6 | 7.3 ± 1.0 | 7.4 ± 0.8 | 9.2 ± 2.8 | 11.1 ± 2.0 | 35.6 ± 18.3 |
| X. couchianus | 22.6 ± 0.4 | 11.9 ± 2.3 | 30.5 ± 1.7 | 36.9 ± 13.3 | 102.6 ± 6.9 | 87.6 ± 10.4 |
| F1 hybrid | 23.7 ± 0.9 | 23.3 ± 2.4 | 42.0 ± 6.1 | 34.1 ± 14.1 | 56.5 ± 14.2 | 220.4 ± 28.0 |
| X. hellerii (wt) | 33.7 ± 2.1 | 22.8 ± 4.5 | 195.1 ± 75.7 | ND | ND | 265.7 ± 19.5 |
| X. hellerii (alb) | 41.7 ± 3.4 | 12.6 ± 2.8 | 40.9 ± 1.7 | ND | ND | 150.3 ± 31.6 |