The new $700 million Sydney Fish Market won't be open in time for Christmas.

Construction at Blackwattle Bay in Sydney's inner-west is set to be completed in mid-November, but customers won't be welcomed at the new facility until January 19 next year.

Sydney Fish Market CEO Daniel Jarosch said that would allow the new development to be able to "open with a bang".

"A January opening gives tenants the time to finish fit outs this year, and then train staff and prepare operationally, so that they are ready to deliver an incredible experience from day one," he said.

Sydneysiders will still be able to buy their seafood for the festive period at the existing site in Pyrmont with record numbers expected to attend its 36-Hour Seafood Marathon to enjoy a "last hurrah".

"It's the end of an era

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