Powdered milk for sure. The scales got serious flash with it.
Best brine....Powdered milk, kosher salt, small amount of green food coloring. Works awesome on the kingers up in Sitka, and here for halibut on the horse herring. Tried it a few years ago after reading it somewhere, had good luck, so I stuck with it. Ya know how that goes. Maybe just a habit, but it seems to work.
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Have pole, will fish.