A peaceful morning walk along the Jersey Shore took a disturbing turn when residents discovered nearly 30 dead sharks scattered across a long stretch of sand—with no confirmed explanation for what killed them.
The grisly scene unfolded Wednesday morning in Sea Isle City, New Jersey, where the carcasses of small dogfish sharks reportedly appeared along approximately 10 blocks of beach.
Local resident Michelle Greenling was walking near the water when she began noticing the animals.
Follow @allchronology“All of a sudden, you start seeing a concentration of small sand sharks, and I thought, ‘Well, this is odd,’” Greenling told ABC affiliate WPVI.
What initially appeared to be an isolated discovery quickly became something much larger. As Greenling continued walking, more dead sharks reportedly came into view, creating what resembled a graveyard of marine predators along the popular coastal destination.
The sharks measured between approximately three and five feet long. Although their presence alarmed beachgoers, dogfish are commonly found along the Jersey Shore and throughout the eastern coastal waters of the Americas.
What remains unclear is why so many died at roughly the same time—and why their bodies washed ashore in one concentrated area.
Marine scientist Stephen Nagiewicz of Stockton University said several explanations were possible. One theory is that the sharks encountered a harmful substance or disease in the water.
“There’s something in the water, and they got sick and died,” Nagiewicz said while considering the possibilities.
However, he described that scenario as unlikely, partly because there had been no reports of people being affected by the water.
Nagiewicz suggested a fishing-related incident was a more plausible explanation.
The sharks may have been caught together in a commercial fishing net and subsequently discarded into the ocean. Alternatively, fishermen may have accidentally lost a net containing the animals. Currents and tides could then have carried their bodies toward Sea Isle City.
“They dumped them over the side or lost a net with all the things in there by accident, and all those sharks just floated up on the beach with the tides,” Nagiewicz explained.
That theory would account for both the number of sharks involved and their sudden appearance along the same section of coastline. Dogfish frequently travel in large schools that can include hundreds or even thousands of animals, meaning a single fishing incident could potentially affect many sharks simultaneously.
No official cause had been announced, however, leaving residents with an unsettling mystery.
Dogfish sharks generally weigh between eight and 22 pounds. They migrate northward and closer to shore during the summer before moving south and farther offshore as colder weather arrives, according to Conserve Wildlife New Jersey.
Their seasonal movements bring them into regular contact with fishing activity.
Because dogfish are abundant and frequently consume bait intended for more commercially valuable species, some fishermen dismissively refer to them as “junk fish.” Yet their role in the marine ecosystem is more complicated than that label suggests.
Like other sharks, dogfish are predators that help shape the balance of ocean food webs. Some populations have also declined over the years, with accidental capture by commercial and recreational fishermen cited as one contributing factor.
Dogfish caught as unintended bycatch may be injured or killed before they are returned to the water. Even sharks released after being hauled onto a boat can sometimes die from stress or physical trauma.
Still, without a formal examination of the animals, it is impossible to know whether fishing activity caused the Sea Isle City deaths.
The New Jersey Department of Environmental Protection had not immediately provided an official explanation when contacted by the New York Post. It was therefore unclear whether the sharks would be tested for disease, toxins, injuries or other possible causes.
The incident also serves as a reminder that dramatic wildlife discoveries along beaches can have several explanations. Mass strandings or clusters of dead marine animals may be connected to fishing practices, pollution, disease, changing water conditions or natural currents that deposit carcasses in one location.
Follow @allchronologyFor those who encountered the sharks Wednesday morning, however, the sight was startling regardless of its eventual explanation.
Sea Isle City is known for its beaches, vacation homes and summer crowds. Finding dozens of dead predators stretched across its shoreline was far removed from the typical morning scene.
Until investigators determine what happened, the image of nearly 30 sharks appearing “all of a sudden” will remain an eerie coastal mystery—one carried out of the ocean and left behind by the tide.