If they are in the location right where they’ve been dropped off from a hatchery truck (and thus haven’t moved from where humans dropped them off), then it’s probably still fair to mark as “captive”. Otherwise, once they’ve moved somewhere they want to go away from that site, they’d be wild.
The genetics are irrelevant to determining wild/captive.
You can see some previous discussion of a similar scenario on this previous thread: https://forum.inaturalist.org/t/spilled-salmon-questions/50167