I know there is some knowledge out there to be shared on this issue, so how often or if at all do 2 different species of fish spawn with each other?

cutthroat x rainbow = cutt-bow... very common in major tailwater trout fisheries.

pink x chinook = pinook.... established population in Great Lakes.

pike x musky = tiger musky ... stocked all over Midwest and Canada

brook trout x lake trout = splake.... commonly stocked in Midwest and Canada

coho x chinook = ??? conooks or chilvers ??? never heard of 'em until the Lewis article. Where I grew up in Alaska, this would never happen as run timing separates these species by one to three months., but here in the PNW where both species return in the fall, it seems probable. Must have poor survival traits overall or we would see a lot more of them.

Hatchery managers like these hybrids for stocking purposes because they are for the most part sterile and can't produce mutant offspring to interfere with wild stocks. They eventually become a put and take product for lakes.

Wonder if anyone has considered making sterile hatchery steelhead to minimize wild interaction? Problem is they probably couldn't get them to move into the river to spawn since they wouldn't have any viable sex organs.

Many salmonid species can interbreed and even produce fertile offspring, but in natural circumstances such crossbreeding occurs only rarely . Reproductive isolation is normally assured by such things as different spawning timing and different preferences in spawning habitat. Cutthroat/rainbow hybridization, for instance, is not a serious problem between coastal cutthroat (Oncorhynchus clarki clarki) and coastal rainbow/steelhead (O. mykiss irideus) in the coastal rivers where they evolved together. In this case, although the spawning timing is similar, the preferred spawning locations are quite different. In areas where the rainbow is an introduced species (including most of the western US outside of the coast and the Columbia River basin) crossbreeding with the other cutthroat subspecies has become a very serious problem, bringing several of them near to extinction.

Don't forget the coho walleye cross the Kowalski!

Surecatch, don't forget the ever popular bullhead crappie cross.

Brown Trout + Brook Trout= Tiger Trout


Tiger trout are stocked exclusively in some Eastern Washington lakes.

Dave, isn't the major problem with the Kowalski's is that they don't know how to swim.

Dave

You forgot one piece:

(coho x walleye) x musky = Kowalski