Iconic fish markets set for crowded annual Xmas marathon Trading at the Sydney Fish Market’s 36-hour seafood marathon will look a little different this year due to strict COVID measures. Food & Entertainment by Adella Beaini Premium Content Subscriber only It's just not Christmas unless the iconic Sydney seafood sale that draws tens of thousands of people at all hours of the day - and night. But trading at Sydney Fish Market's 36-hour seafood marathon will look a little different this year, thanks to strict COVID measures that have been put in place. In previous years, the market has drawn more than 100,000 people as they grab last-minute Christmas seafood supplies, with approximately 370 tonnes of seafood sold.