01 - Pat fish fillets completely dry with paper towels. Brush both sides with olive oil, then rub with Cajun seasoning and salt until evenly coated on all surfaces.
02 - In a medium bowl, combine shredded cabbage, carrots, chopped cilantro, lime juice, and mayonnaise. Season with salt and pepper, toss thoroughly to combine, and set aside to let flavors meld.
03 - In a small bowl, whisk together sour cream, lime juice, smoked paprika, and a pinch of salt until smooth and well incorporated. Refrigerate until ready to serve.
04 - Heat a large skillet or cast-iron pan over medium-high heat until hot. Add seasoned fish fillets and cook for 3 to 4 minutes per side until blackened on the exterior and opaque throughout. Transfer to a plate and gently flake into large chunks.
05 - Warm tortillas in a dry skillet for 30 seconds per side or wrap in foil and heat in a 300°F oven for 5 to 7 minutes until pliable and warm.
06 - Layer a generous portion of slaw and blackened fish pieces into each warm tortilla. Drizzle with crema and serve immediately with lime wedges on the side.