In article , writes:

I'd like more information about those earlier attempts because local
opposition to sea based fish farms are claiming that Atlantic escapees
are already breeding in northern rivers.

Any ideas where to look ?

http://www.wa.gov/wdfw/factshts/atlanticsalmon.htm

"Numerous attempts have been made in the 20th century by agencies on the
Pacific coast to introduce and establish Atlantic salmon. The most recent
attempt by WDFW was in 1981 when attempted introductions were made via
the release of cultured Atlantic salmon smolts. No adult Atlantic salmon
adults returned as a result of the releases. "

http://www.barbarycoastdivers.org/2002/08aug/p7.htm

"Indeed, a National Marine Fisheries Service report on "The Net Pen
Salmon Farming Industry in the Pacific Northwest," released last year,
classifies hybridization and colonization of Atlantic salmon in the
Pacific as having "little or no risk." The report notes decades of
aggressively attempted yet unsuccessful introduction of Atlantics as
sport fish. It quotes an estimate of one million Atlantic salmon escaped
from sea cages into Puget Sound and British Columbia since 1990 with no
evident attachment. It says that "few prey items of any sort have been
found in the stomach contents of escaped Atlantic salmon which have been
recaptured." In other words, the domesticated salmon, which are able to
live for months without eating, as are wild fish returning to spawn, have
thus far been unable to establish themselves in this ocean."

http://www.salmonfarmers.org/pdfs/colonization.pdf

gives an overview of the salmo salar introduction efforts on the west
coast.
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