Nope: Two things make Girards unique. Their propensity to eat Fry of
other species......most rainbows don't care for em much, AND mainly
their propensity to go 4 or 5 years before sexual maturity. Has nothing
to do with the lake or stream spawning characteristics other than a good
availability of fry for the feeding frenzy needed to grow 10 to 20 pound
Rainbows.
The combined characteristics above and any lake with a sockeye run will
produce Girards including Quesnel and Horsefly and others.

Ever heard of Rainbow Alley?? There's a excellent quality fishery for them on
the upper Babine out of Smithers just below Babine Lake. Very Secret August
fishery that Canadians will seldom mention to US Yanks.