OCEAN HEALTH
Apex-Predator Abundance (APX)
Density of apex predators, the keystone the food web hangs from. Their absence is the first and slowest-reversing sign of a system fished past balance.
Threshold Bands
| Band | Range | State |
|---|---|---|
| Intact | ≥ plan | OK |
| Reduced | 40–100% plan | WARN |
| Collapsed | < 40% plan | CRIT |
Formula
Density of sharks and large predatory fish from baited-camera and transect counts.