S malma

I found my way to a long bibliography of papers on wild:hatchery co-mingling compiled by Bill Bakke that contained many of the works you cited.

In reviewing some of these abstracts on steelhead and chinook, it is unclear to me whether the observations of poor productivity by naturally spawning fish of hatchery origin would still hold up in a program where locally adapted wild broodstock was used for artificial propagation.

Is there any more recent work out there that looks specifically at the natural productivity of hatchery fish derived from locally adapted wild broodstock? The results from the Kalama studies should be no surprise as a poorly adapted non-local broodstock was used.

I have seen the use of locally adapted wild brood stock advocated repeatedly, but is there any hard evidence out there that shows it really makes a difference?