I would call it a wild fish.
This whole Nate versus Hatchery thing is ridiculous. Answer me this. Ok say a hatchery just started operations, They need brood stock. They siened a few holes from the river the hatchery is on. They captured pure stock specific to that stream. Would the prodgency of those first brood stock fish be native? Yes they would. They are not wild fish but native.
Down here there is a stream that has both winter steelhead and summer steelhead. All the winter are native. All the summers are not, even though we do catch some that were born in the wild. These summer steelhead were never present in the system until dams were built and a hatchey was built and the summers introduced.
Every summer I get into the Nate, Wild, Hatchery discussion with people who happen to land an unmarked summer steelhead. They call them native, I tell them its wild. Then I have to explain the difference.
Does this help or confuse?