Effects of thiourea treatment on tilapia juveniles
| . | 0 p.p.m. . | 300 p.p.m. . | 600 p.p.m. . | 900 p.p.m. . |
|---|---|---|---|---|
| Total length (mm) | 13.7±1.1a | 11.3±0.5b | 10.7±0.4c | 10.4±0.4c |
| Wet mass (mg) | 35.1±11.0a | 16.4±2.6b | 12.9±1.4bc | 10.9±1.6c |
| Mortality (%) | 0 | 13.6 | 50.8 | 44.1 |
| Otolith growth | ||||
| Core to TC (μm) | 127.4±10.3a | 127.8±8.5a | 128.8±5.9a | 127.1±7.2a |
| TC to edge (μm) | 80.5±27.2a | 45.4±6.1b | 34.8±6.9c | 33.2±4.8c |
| Newly deposited DGI | 13.0±1.3a | 11.0±0.9b | 9.0±0.9c | 9.2±1.1c |
| . | 0 p.p.m. . | 300 p.p.m. . | 600 p.p.m. . | 900 p.p.m. . |
|---|---|---|---|---|
| Total length (mm) | 13.7±1.1a | 11.3±0.5b | 10.7±0.4c | 10.4±0.4c |
| Wet mass (mg) | 35.1±11.0a | 16.4±2.6b | 12.9±1.4bc | 10.9±1.6c |
| Mortality (%) | 0 | 13.6 | 50.8 | 44.1 |
| Otolith growth | ||||
| Core to TC (μm) | 127.4±10.3a | 127.8±8.5a | 128.8±5.9a | 127.1±7.2a |
| TC to edge (μm) | 80.5±27.2a | 45.4±6.1b | 34.8±6.9c | 33.2±4.8c |
| Newly deposited DGI | 13.0±1.3a | 11.0±0.9b | 9.0±0.9c | 9.2±1.1c |
Fish were immersed in different concentrations of thiourea (TU, p.p.m.)from 15 to 27 days post-hatching (d.p.h.) and were then killed for measurement on 28 d.p.h. Data are shown as means ± s.d. (N=15–18). TC, tetracycline mark; DGI, daily growth increment. Values with different superscript letters are significantly different (P<0.05)