Pre-defrost the fish, leaving it in the fridge for 10-12 hours.
Mix in small bowl the orange marmalade, 2 tbsp of olive oil, wine vinegar, orange juice and finely chopped parsley leaves, season with salt and add half of the paprika, stir.
The fish fillet into two fillets, season with salt and pepper, brush both sides with olive oil and sprinkle with the remaining paprika. Heat a frying pan over medium heat and fry the fillets for 2 minutes on each side.