Table 1.
Southern stingray (Hypanus americaus) ejaculate characteristics and plasma testosterone concentrations ( ± SEM) by month.
| Parameter | March n = 7 |
June n = 7 |
|---|---|---|
| Volume (mL) | 0.29 ± 0.1 a | 2.12 ± 0.45 b |
| pH | 7.43 ±0.27 | 8.06 ± 0.04 |
| Osmolarity (mOsm) | 776 ± 66.9 | 857 ± 38.9 |
| Total motility; raw (%) | 5.71 ± 2.77 a | 51.4 ± 14.3 b |
| Status; raw (0–5) | 0.71 ± 0.36 | 1.5 ± 0.46 |
| Total motility; in ASW (%) | 32.9 ± 12.0 | 33.6 ± 15.5 |
| Status; in ASW (0–5) | 1.21 ± 0.46 | 1.57 ± 0.57 |
| Concentration (×106 sperm/mL) | 1296 ± 353 a | 371 ± 104 b |
| Total sperm count (×106) | 280 ± 88.4 | 284 ± 46.2 |
| Plasma total testosterone (ng/mL) | 8.0 ± 7.2 a | 97.3 ± 11.3 b |
Superscript letters (a, b) indicate significant differences in sperm parameters between months. ASW = artificial sea water.