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[halcyonguitars]

I'm sure there's a reason, but it seems like it would make sense to have a native population if they're committed to having fish in a lake...

[Rodney]

http://www.gofishbc.com/Blog/Science-and-Research/Maximizing-Fish-Performance.aspx

[clarki]

There's lots of info on the stocking program on the GoFishBC website, however I think this blog post best answers your question.  http://www.gofishbc.com/Blog/Science-and-Research/Maximizing-Fish-Performance.aspx

In short, the stocking program generally exists to provide a recreational fishery, not to enhance wild stocks.

They don't want stocked trout to spawn and interfere with the existing "wild" trout population and because they don't spawn, the trout grow faster and don't go through a period that where they are dark, skinny and poor table fare.     

Rodney can type faster. Great minds think alike! 

[typhoon]

Spawn bound trout is a big one. Lakes with no ingress or egress creek end up with fish that carry milt and eggs all summer.
In low water even lakes like Roche produce spawn bound diploid fish (hence the spawning channel).

http://www.fishingwithrod.com/fish_profile/rainbow_trout.html

[halcyonguitars]

Well, there ya have it, thanks!