Unwrap white fish and place it onto a plate in a single layer. Ideally, pack some ice or plastic ice blocks around the fish, then cover. Use as soon as possible. It’s possible to freeze white fish. A whole fish should be prepared before it’s frozen: gut the fish and remove the gills, or fillet the fish, but leave the skin on. Freeze single fish or two fillets in thick freezer bags, taking care to exclude air. Home freezing is effective for a short period of time, but aim to use the fish within six weeks. White fish can be cooked from frozen, but it takes a little longer.