In a large cast-iron skillet, heat oil over medium-high heat.
Sprinkle blackening seasoning all over catfish. Carefully place fish in skillet. Cook until well browned and flakes easily with a fork, 4 to 5 minutes per side.
In a medium skillet, heat cauliflower rice over medium heat until heated through, 5 to 10 minutes. Stir in lime juice, cilantro, and salt. Serve fish over cauliflower rice with lime wedges. Garnish with cilantro, if desired.
Recipe by Louisiana Cookin' at https://louisianacookin.com/louisiana-favorites/