Planning Christmas seafood in Australia: how to buy prawns and fish without overpaying

Christmas seafood is one of the biggest single grocery purchases of the year

For many Australian households, a kilo or two of prawns is as essential to Christmas as a roast. The problem is that prawn prices spike significantly in the weeks before Christmas — sometimes doubling compared with the same product earlier in the year. Understanding how to navigate this helps you get what you want without paying the peak premium.

How prawn prices move toward Christmas

Wild-caught Australian prawns — king prawns, tiger prawns, banana prawns — are in seasonal supply, and the pre-Christmas period is when demand surges while supply does not always keep pace. Prices at supermarkets and fishmongers typically begin climbing from late November and reach their highest point in the week before Christmas.

Frozen prawns bought in October or early November can be significantly cheaper per kilogram than the same product in the week before Christmas. If you know how many people you are catering for and have freezer space, buying frozen prawns now and defrosting close to Christmas is a straightforward cost saving.

Frozen versus fresh for Christmas

For most Christmas prawn platters and seafood spreads, frozen-and-defrosted prawns are comparable in quality to "fresh" prawns from a fishmonger that have themselves been previously frozen (as most have). The main difference is the freshness window after defrosting — freshly defrosted prawns are best eaten within a day or two.

If you are serving whole unpeeled prawns on ice, buying frozen ahead of time and defrosting in the fridge overnight is practical and significantly cheaper per kilogram than buying fresh in peak week.

How much to buy

For a Christmas prawn platter as part of a spread with other food, approximately 300–400 g of whole unpeeled prawns per person is a generous serving. For prawns as a primary protein (e.g. a seafood-centric Christmas), increase to 500 g per person.

For peeled and deveined prawns, reduce these quantities by around 30–40% to account for the lower shell weight.

Fish and other seafood

Salmon fillets, whole fish, oysters and scallops are all subject to similar pre-Christmas demand pressure. Salmon in particular is widely available frozen year-round and can be bought now and frozen for Christmas use.

Oysters are genuinely best bought fresh close to the date — they do not freeze well and their quality depends on very recent harvest and handling.

Supermarket versus fishmonger for Christmas

Supermarket frozen prawns are priced consistently and available in larger pack sizes. Fishmongers offer fresher whole fish, specialty varieties not stocked in supermarkets, and advice on preparation — worth using for a centrepiece whole fish or if you want a specific variety.

For bulk prawns and common fillets, comparing the current supermarket price on TrolleyChecker before deciding where to buy gives you a useful baseline.

Timing your Christmas seafood shop

• October and early November: Buy frozen prawns and salmon if you have freezer space, at pre-surge prices.
• Late November: Confirm guest numbers and finalise quantities.
• Week before Christmas: Buy anything that needs to be very fresh — oysters, whole fish, scallops — and defrost frozen prawns bought earlier.