In a large bowl, whisk paprika, thyme, oregano, garlic powder, onion powder, cayenne pepper, black pepper, and salt. Make sure all the spices are blended so there aren't any hot spots.
Rinse the fish and pat it dry with a paper towel.
Brush both sides of the fillets with melted butter, then coat evenly with the blackening spice mix, pressing gently to help it stick.
Heat a cast-iron or heavy stainless steel skillet over medium-high heat. Add 1 tablespoon of butter and swirl to coat the pan.
Once the butter melts, place the fish in the hot skillet.
Sear for 2-3 minutes per side, or until the fish flakes easily with a fork. The internal temperature should reach 145°F (62.8°C) with an instant-read thermometer.
Remove from heat and let the fish rest for a minute.
Serve with fresh lemon wedges.
Recipe courtesy of Cooking In The Keys
https://cookinginthekeys.com/blackened-tripletail/...