A dead Greynurse shark was taken away from Lake Conjola's entrance on Wednesday.
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About 4.30pm on July 3, four visitors from Wollongong and five NSW Fisheries staff lifted the "heavy" 7-foot shark out of the entrance inside of the lake.
Dene Warren of Wollongong was taking a winter break with friends at Lake Conjola when they noticed a 4WD on the beach.
"NSW Fisheries staff jumped out and we jumped in the water and offered them a hand," he said.
"It took all of us to lift it."
Mr Warren believed the shark was stranded on the afternoon low-tide.
READ MORE: Lake Conjola's entrance opens on high tide
"Unfortunately, the Greynurse had died, it must have been trapped," he said.
He said NSW Fisheries took the shark away for scientific purposes.
"If it was alive we could have released it, but it was long gone."
A NSW Department of Primary Industries spokesperson said the shark was estimated to be 7 feet by Fisheries Officers.
Officers found the dead shark resting against a submerged sand bank, held in place by the outgoing tide.
The shark is now being examined by Fisheries experts, the spokesperson said.
According to the NSW Department of Primary Industries Greynurse sharks can grow to a maximum of 3.2 metres and migrate between a number of key sites from Montague Island near Narooma to Fraser Island, Queensland.
As of 2016 Greynurse sharks were listed as critically endangered. Some critical habitat sites in NSW include Montague Island, the Tollgate Islands off Batemans Bay and Magic Point in Sydney.
It is illegal to fish or possess a Greynurse shark.
Updated with comment from a NSW Department of Primary Industries spokesperson.