Coho Dying Before Spawning

Volunteers patrolled Byrne Creek in SE Burnaby, BC, today for spawning salmon. It was a good count for our little urban creek, but unfortunately we are yet again seeing Coho prespawn mortality.

This means that Coho die before they spawn, and the first female we found this year was dead yet full of eggs. This issue has been studied in Washington State, and the smoking gun is a chemical in tires that washes off roads and into creeks. For some reason it kills Coho but Chum are not affected.

We get so few Coho back every year that each unspawned female is a small tragedy.

Total chum:

6 live chum

3 dead chum

Total coho:

5 live coho

1 dead coho (prespawn mortality again)

Dead female coho full of eggs