Beware of Lion’s Manes in Boston Harbor – Several “jellyfish-sting” incidents reported.

Under the sea

If you’re like us, seeing jellyfish in the ocean – or worse – bumping into a jellyfish while swimming – freaks us out.  Now picture seeing a giant red jellyfish swimming near the beach.  (Cue the Jaws theme.)

According to a “Curley Beach Alert – Lion’s Mane Jellyfish” email from the Curley Community Center on Wednesday, there were a few “jellyfish-sting incidents.” 

Dear BCYF Curley Beach Patrons,

We want to inform visitors that several jellyfish-sting incidents have been reported at the BCYF Curley Beach today, Wednesday, June 24th.

As a precaution, warning signs have been posted throughout the facility, and staff will be making periodic announcements to keep patrons informed. Lifeguards will be at the shore’s edge, providing warnings as well.

To prioritize safety, water access is currently restricted for all minors for the remainder of today, Wednesday, June 24th. Minors will again be able to enter the water at parents’ or guardians’ discretion starting June 25th. Adult patrons who choose to enter the water today and the remainder of the summer should be aware of the increased jellyfish presence and exercise caution.

Jellyfish are a natural part of the marine environment, and their presence can vary with tides, currents, and weather conditions. While beach operations remain open at this time, we encourage all visitors to remain alert and follow instructions from lifeguards and staff. If you experience a jellyfish sting or require assistance, please notify a lifeguard or staff member immediately.

We will continue to monitor conditions closely and provide updates as needed. Thank you for your cooperation and understanding.

Sincerely,
-The BCYF Curley Team

Should I be afraid?

Well, no need to run out of the water screaming if you see one, but keep your distance. They can sting you. 

Is it strange to see them in Boston Harbor?

According to the Boston Globe, they have been spotted in Boston Harbor in the early summer months, and they are usually on the smaller size, between 4 and 18 inches long.  The ones in the north can stretch as long as 8 feet wide.  Yikes.

Last year, one was found washed up on the beach at Pleasure Bay. 

So consider yourself warned.  Between lion’s manes and mola molas in Boston Harbor, swim at your own risk.

Image is not actual Lion’s Mane at the L, it’s a stock image so you know what to flee from. 

One Comment

  1. Brendan Mahoney June 24, 2026 at 8:00 pm - Reply

    Several jellyfish stings were reported today at the summer camp down at the L!

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