Mix the courgettes, olives, caper berries, oil and oregano in a bowl, season. Place the vegetables in the centre of each sheet of baking paper.
Place the fish fillets on top, season. Shape the baking paper into parcels, twist the ends together or tie with kitchen twine, place the parcels on a baking tray.
Approx. 20 mins. in the centre of an oven preheated to 180°C. Remove.
Whisk together the lemon zest, lemon juice, oil, oregano and parsley, season with salt. Open up the fish parcels, plate up the vegetables and fish, drizzle the dressing on top.