Not sure whether you're referring to the pattern, Karluk Falsh Fly or flies with flash in them.... I've never bothered using the Karluk Flash Fly around here. I've been told it was originally designed for use on the Karluk River on Kodiak Island for Silver Salmon. like other Pacific Salmon patterns, it probably works at many other spots as well, at any given time.
There're many patterns available that're flashy or incorporate flash in them. Such as, gold/silver Comets, Goldsmith/Silversmith, to name but a few. Tony can better answer your question then I but I believe that he was referring to incorporating flash into patterns he was using for Stripers to imitate baitfish for taking spring Salmon. Clousers (grey/white, olive/white, chartreuse/white) for example..... All of these patterns are baitfish imitations.
Use of these patterns makes a lot of sense if you think about it. Springers come into the river systems early and are still feeding as their egg/milt sacks are not yet developed. Springers summer over in the rivers and spawn in the fall/winter. They spend more time in the rivers than their cousins and must feed to sustain themselves until ready to spawn.
The closer Pacific Salmon get to spawning time the more constricted their stomachs become and feeding becomes increasingly instinctual. That dicatates a change in bait/fly/lure types. Then less flash and darker patterns become more effective. (you'll find that this idea is very controversial to some but it makes sense to me )
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