The Sydney Fish Market will be redeveloped into a high-rise precinct containing the equivalent number of dwellings as 10 of the residential towers slated for Barangaroo, government documents reveal.

Urban Growth has forecast up to 2760 new dwellings will be built at the Bays Market District, a thin strip of waterfront land encompassing the fish market, car park and a boat dock.

Sydney Fish Markets will be redeveloped into a high-rise precinct. Credit:Lidia Nikonova

The site is opposite Wentworth Park, where the Department of Education is building a "pop-up" school on a greyhound racetrack to house 300 primary students while Ultimo Public School is redeveloped into a high rise.

Greens MLC David Shoebridge expressed surprise at the residential density proposed for the fish markets, and said it was "mind-boggling" this population growth wasn't being taken into account in the department's planning for the inner city school.