TABLE 1.
Characteristics from fish collection sites
| Source | Site | Temperature at fish collection (°C) | Annual temperature range (°C) | Conductivity (µS/cm) | pH | DO (%) |
|---|---|---|---|---|---|---|
| Ambient | Twilight Stream | 19.6 | 13–20 | 140 | 7.03 | 66 |
| Tahnua Torea | 21.3 | 12–23 | 275 | 7.55 | 82.2 | |
| Tourist Stream | 21.8 | 13–23 | 134 | 6.99 | 51 | |
| Auckland Domain | 24.8 | 12–25 | 307 | 7.64 | 55.5 | |
| Warm | Lake Ohakuri | 30.0 | 26–30 | 337 | 7.51 | 104 |
| Miranda Hot Spring | 32.1 | 29–35 | 632 | 7.88 | 141.7 | |
| Awakeri Spring | 35.1 | 35–37 | 889 | 7.52 | 63.3 | |
| Akatarewa Stream | 36.0 | 24–37 | 483 | 7.43 | 75.5 |
We recorded temperature, conductivity, pH, and dissolved oxygen (DO) measurements at the time of fish collection. Annual temperature range measurements were taken from bi‐monthly measurements over one year. Warm‐source fish are from geothermal systems, whereas ambient‐source populations are from systems with no geothermal influence.