Thanks all for the responses and the info! A follow-up question I have is related to the ability of Capilano anadromous fish to naturally spawn. I know there are small creeks and tributaries with small populations but aside from those, do the Cap support any kind of natural spawning or everything is hatchery driven? My understanding is that the dam will block the gravel but is common to see many salmon in "spawning mode" in the upper river pools during November/December. Always wondered if that will come to anything or the eggs will just get washed away.
Thanks
The hatchery trucks a few thousand coho to the upper watershed above the dam every year and those fish spawn quite successfully. They also used to monitor downstream migration in the upper river and the fry and smolt numbers they captured were very similar to what you would expect to get for a wild population.