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[~IvAn~]

The only reason fish whether it be salmon or steelhead return is to SPAWN, that is their entire drive. Take away that drive and urge and they wont return

[Easywater]

^ Thanks.

Question still remains, would they retain the same migratory instincts, even if they were infertile?

You are asking a very complicated question.

What triggers the return to the river?
Is it a hormonal/chemical reaction in the fish or is it an environmental reaction that affects all fish?

My guess is that the fish would never return to the river.

Edit: oops, didn't read the second page but we both came to the same conclusion.

[Gooey]

Don't triploids get very large (and quickly too) because all energy goes to physical development vs sexual maturity....imagine releasing a bunch of triploids into the ocean never knowing if they would come back...seems like a very dangerous idea for an eating machine that could through an ecosystem out of whack.