"I was fishing the Veddar this past Tuesday" see OP
"nearly impossible" sounds like it is possible..... Why are we allowing that??
I see. I highly doubt a Brown would be in the Vedder, but I guess it is just as possible as an Atlantic.
Secondly how's this for nearly impossible....
1) They have to find a mate, good luck when the only ones coming up are complete strays with no homing what so ever.
2) They are very poor colonizers and are a very passive fish, which is why you can keep them in very high densities unlike pacific salmon. They would not be able to compete for spawning grounds if they even did pair up.
3)Atlantic salmon are very susceptible to the virus IHN. Nearly all pacific salmon are carriers of this, but do not get sick from it. Atlantic's however are very susceptible to this and will die if they get it. With millions of carries passing them on the way to the ocean it is near impossible not to catch it.
4) If they somehow manage to find a mate, then find spawning area, and avoid getting a virus completely lethal to them, then they will get out competed for food, because once again pacific salmon are very territorial and aggressive and Atlantic's are not.
As said before, take into the fact that the province stocked millions of Atlantic's back in the day in the form of eggs and smolts, and not a single run has been established in any of the rivers they were stocked into. Some include : French Creek, Qualicum Rivers, Chemainus River, Cowichan River. Some Lakes: Nanaimo Lakes, Sproat Lake, Shawnigan Lakes, Cowichan Lake and Great Central Lake. The only place they were last seen as wild naturalized was in the Kokish river in 1992.