JR32,

They're doing that study right now down on the Kalama...they count and DNA sample every fish that they pass over the falls at the upper hatchery, and they count the smolts coming back down.

Not only can they tell you what percentage of the pairs of spawners were WxW, HxW, or HxH, they can actually tell exactly which two parents produced a smolt.

The results are pretty consistent;

WxW, HxW, and HxH all spawn and all produce smolts at a fairly equal rate.

When those smolts return from the sea as adults, they are almost entirely adults from the WxW crosses, with some HxW crosses, and statistically zero HxH crosses.

There was a thread on this study with all the important information not too long ago, I'll see if I can find it.

Fish on...

Todd