Rub the corvina fillet with olive oil, then add salt, pepper, garlic powder and smoked paprika.
In a skillet on medium heat add the olive oil and butter and bring the temperature to about 350° then add the fish fillet.
Cook the first side of the fish until it is nearly opaque half the thickness, about 4 minutes.
Turn and cook until the whole thickness of the fish is opaque and the internal temperature is around 136° to 138°, about 4 more minutes. Turn off the heat and cover for 2 minutes. The internal temperature should now be at least 145°.
Serve right away.
Calories are estimated for a 7-ounce fillet cooked in olive oil.