06/09/2026
What is a redd? Why does redd scouring affect salmon populations?
FROM THE ARCHIVES:
🔴Redd: a salmon nest. Each one can hold hundreds to thousands of eggs.
🔴Redd Scour: when a salmon nest gets washed away.
Historical logging and climate change have made our rivers on the West Coast of Vancouver Island more “flashy”.
This means we have more frequent and intense high-flow events. In watersheds that have already been altered by development or industry, water from heavy rainfall is rushed into the streams in the valleys below. The land surrounding the rivers has less ability to absorb, retain, transpire, and slow the flow of water.
These conditions increase the risk of redd scour, where salmon nests are flushed downstream before eggs have a chance to hatch.
Since each redd contains so many eggs, and with already a small chance of survival, redd scour can have a major impact on salmon populations.
This video explains our multi-year scour chain study in hiłsyaqƛis (Tranquil Creek), where we have been working to understand where and when redd scour is happening.
Check out our YouTube for the full video!
Video:
Thank you to , , , & the BC Salmon Restoration Innovation Fund for supporting this important research over the years.