HUSBANDRY
Hatchery Spawn Index (SPI)
Share of conditioned broodstock actively spawning. The pulse of the Broodstock Ark and the leading indicator of rewilding supply.
Threshold Bands
| Band | Range | State |
|---|---|---|
| Productive | ≥ 50% | OK |
| Slow | 30–50% | WARN |
| Stalled | < 30% | CRIT |
Formula
Active spawning pairs ÷ conditioned broodstock pairs.