In a mixing bowl, combine the olive oil, lemon juice, minced garlic, dried oregano, salt, and black pepper. Whisk together until well blended.
Place the fish fillets in a shallow dish and pour the marinade over the top. Ensure that the fish is evenly coated. Cover and refrigerate for at least 15 minutes.
Preheat your grill to medium-high heat (about 375°F to 400°F).
Remove the fish from the marinade and gently shake off any excess. Place the fillets skin-side down on the grill.
Cook for 4-5 minutes on each side or until the fish flakes easily with a fork and is opaque in the center.
Carefully transfer the grilled fish to a serving platter. Garnish with fresh parsley and serve with lemon wedges on the side.
Be attentive while grilling, as cooking times may vary depending on the thickness of the fish fillets.
If using skin-on fish, grilling skin-side down first will help keep the fish together and enhance its flavor.
You can also experiment with different herbs and spices for the marinade to customize the flavor to your liking. Enjoy your grilled fish with a side salad or steamed vegetables for a complete meal.