I use cast netted threadfin almost all year long on Old Hickory. They catch everything. My problem with threadfin for crappie is when they are small, they die really easily and about the time they get strong enough to swim well with hook, they are a little big for crappie. Not that you can't catch crappie on them, but it selects for the biggest crappie. Nice to catch, but numbers are way down compared to typical small crappie minnows.
I have a side scan also and those big shad schools are key to finding most game fish for me. Figure out the depth, structure, and area of the creek the threadfin are in and then focus on typical structure that intersects with it. Great for bass and catfish. You don't have to fish right in the shad school all the time. But sometimes it is crazy how many fish are right with the schools of shad. Carolina rig the shad or vertical fish them if it is deep enough. You can catch almost any species back to back.
Good Luck,
Jim
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