They are just picky, even when spawning.
If you fly fish, skating an elk hair caddis on a very long leader can elicit some strikes.
Tiny panther Martin spinners also work, or a worm/maggot under a very carefully balanced slip bobber.
Usually they are way too wormy to eat though, at least in the places I catch them.
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“Nothing is more persistent than a liberal with a dumb idea” - Ebrand
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