The shark washed up on Dune Road Beach in Quogue but was pulled back out to sea before police could secure it.
Officials are warning swimmers and boaters to be aware of the dead shark and keep their distance.
The Riverhead Society said it appears to be a large white in the photos.
“We have been in contact with the South Fork Natural History Museum Shark Research and Education Program who are attempting to monitor this situation along with our law enforcement partners,” Quogue Police said in a statement. “At this time we are warning swimmers and boaters in the area to be aware of this ongoing situation and to keep their distance so law enforcement can monitor this event.”
The beach has been a popular spot this week with all of the hot and muggy weather, but some had cooled their plans for a dip in the sea this week due to ongoing shark sightings across the area.
Rockaway Beach, Long Beach, Jones Beach and East Atlantic Beach were all closed to swimming, at least briefly, Tuesday due to shark sightings.
They reopened on Wednesday.
“It was 5-6 feet, 25 yards away, and it definitely had the triangular fin,” said an East Atlantic Beach lifeguard. “We both saw it, and we took the proper precautions, informed the lieutenant, put a red flag on the beach.”
Swimmers have also spotted at least two sharks at Rockaway Beach.
By the end of Tuesday day, people were allowed in the water, but only up to their knees.
Gov. Kathy Hochul has ordered increased shark patrols in the state following several recent sightings and bites.
RELATED | shark alley? More sightings off Long Island beaches as swimmers have been urged to exercise caution
Anyone who spots the shark is asked to call the Quogue Village Police Department at 631-653-4791.
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https://6abc.com/quogue-shark-great-white-sharks-washes-ashore/12063744/ Quogue shark: Dead shark appearing to be great white washes up on Long Island beach amid ongoing shark sightings