Scrub mussels, remove beards. Shell and devein shrimp. Cut fish into 5 cm chunks. Cook onion and garlic in salad oil until tender. Stir in tomatoes with their liquid, clam juice, tomato paste, wine, and seasonings; heat to boiling. Pour tomato mixture into 3 litre casserole; add fish chunks, mussels and shrimp. Cover casserole and bake 20-25 minutes until fish flakes easily, mussels open and shrimp are tender. Sprinkle with parsley