I have chopped them up, tied them in spawn sacks, immersed them in shrimp oil and froze them. They work as well as fresh shrimp from my experience. It takes some work but the spawn sacks stay on for as long as you want to throw them.
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In the legend of King Arthur, the Fisher King was a renowned angler whose errant ways caused him to be struck dumb in the presence of the sacred chalice. I am no great fisherman, and a steelhead is not the covenant of Christ, but with each of these fish I am rendered speechless.