Toss coleslaw mix with hot sauce and juice from half a lime; set aside for 5 minutes.
Pat catfish fillets dry, coat generously with Cajun seasoning on both sides, and season with salt.
Heat oil in a large skillet over medium-high heat, then fry catfish 4 minutes per side until darkened and cooked through.
Lightly toast rolls if desired, then build sandwiches with one fillet and a generous spoonful of slaw on each.
Serve immediately with extra lime wedges and any remaining slaw on the side.
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