Take a frying pan and add 3 tablespoon of olive oil to it. Use the ladle to spread the oil around the corners and allow it to heat.
Meanwhile, wash the fish pieces and coat it with some lemon juice and keep it aside. Mix flour, salt, paprika powder, onion and garlic powder in a bowl. Use your hands to varnish the fish in the mixture. Make sure that the fish is evenly coated.