The woman who was attacked by a shark at Rockaway Beach this week is suspected to have lost ” approximately 20 pounds of flesh” due to the gruesome bite, police sources told The Post Tuesday.

The victim, a 65-year-old Queens woman, was attacked while swimming alone off the shore near Beach 59th Street shortly before 6 p.m. Monday — losing a large chunk of her left leg, above the knee, to the shark, according to sources and a photo of her injury.

Lifeguards spotted her screaming for help in the water — and pulled her to shore, where she was given first aid. A tourniquet was also applied to her leg to help stem the bleeding before first responders arrived.

The woman was taken to Jamaica Hospital, where staff said she was in stable but critical condition Tuesday.

The rare shark attack – believed to be Rockaway Beach’s first since 1953 – prompted the city Department of Parks & Recreation to shut down swimming and surfing at the popular seaside spot Tuesday.

“We hope for a full recovery for this swimmer,” the Parks Department said in a statement. 

“Though this was a frightening event, we want to remind New Yorkers that shark bites in Rockaway are extremely rare. We remain vigilant in monitoring the beach and always clear the water when a shark is spotted.”

NYPD scoured the area with helicopters and drones following Monday evening’s attack, but did not spot any sharks.