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Giant Jellyfish with 100-Foot Tentacles Return to Gulf of Maine Waters; Can Still Sting After Death

The large jellyfish can still sting when dead, and experts say some can wash up on New Hampshire beaches through the end of fall.

  • Lion's Mane jellyfish have returned to the Gulf of Maine, with tentacles that can grow more than 100 feet long. The large creatures are appearing in New Hampshire's coastal waters.
  • Sam Rutka, lead aquarist at the Seacoast Science Center, describes them as "bizarre and alien-like." Although they typically inhabit deeper, colder waters, winds and currents sometimes bring them close to shore.
  • Stings may cause a rash similar to fiberglass contact. Experts advise washing the area with salt water and applying heat or white vinegar, but warn: "You should never, ever use urine."
  • Officials emphasize jellyfish "don't want to interact with you," though even dead creatures can still sting. Swimmers should avoid contact and notify lifeguards if they spot one washed ashore.
  • A 2010 mass stinging event at Wallis Sands in Rye, New Hampshire, affected more than 100 people. Jellyfish are expected to remain in the area through the end of fall.
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Giant jellyfish with 100-foot tentacles return to Gulf of Maine waters; can still sting after death

'BIZARRE AND ALIEN-LIKE' | They can grow tentacles more than 100 feet long. Lion’s mane jellyfish have returned to the Gulf of Maine, and officials say beachgoers should be aware.

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WMUR broke the news in New Hampshire, United States on Tuesday, June 23, 2026.
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