Combine pickling salt and water. Soak fish in brine mixture for 48 hours. Drain well; cover with white vinegar for 24 hours. (Don't use metal container.) Boil 4 cups vinegar on stove. Remove; stir in sugar and white wine. Add pickling spices. Pack alternate layers of fish and onions into jars or plastic containers. Cover with marinade. Store in refrigerator for a couple days.