Preheat oven to 400°F. Mix first 7 ingredients in small bowl. Place fillets on baking sheet. Brush on both sides with 1 tablespoon oil. Sprinkle top of each with seasoning.
Heat heavy large skillet (preferably cast-iron) over high heat until very hot. Add remaining 1 tablespoon oil; swirl to coat. Place fillets, seasoned side down, in skillet. Cook until very brown on bottom, 1 minute. Return fillets, browned side up, to baking sheet. Place in oven; bake until just opaque in center, about 8 minutes. Top each with 1 teaspoon butter.
Fennel seeds add a hint of licorice to the spice mix. You could probably leave it out if you want. The recipe seems to get most of the cajun-ness from the other spices. I'm not a huge fan of fennel anyway. Let me know how it turns out. If it's okay without the fennel, I might try to make it that way from now on. Fennel seeds are a pain to grind/chop up.
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