Jellyfish Surge Swamps Delaware Beaches This Summer

Beach-safety patrols across Delaware report a dramatic rise in jellyfish encounters this summer. Lifeguards at Rehoboth Beach, South Bethany Beach, Dewey Beach and Lewes Beach have logged hundreds of stings each day since the end of July, with the Rehoboth team recording 150–200 incidents daily and Lewes lifeguard Braden Jones noting an average of about 100 daily. The stings affect swimmers of all ages and have even sidelined lifeguards who are reluctant to re-enter the water.

The Guardian

Chris Petrone, director of the marine advisory service at Delaware Sea Grant, attributes the surge to a “perfect storm” of warmer air and water temperatures, heightened salinity from drought, altered seasonal winds and favorable water-circulation patterns. He adds that the relatively quiet hurricane season this year has allowed jellyfish populations to remain near shore, whereas stronger storms would typically disperse them offshore and bring cooler bottom waters that inhibit summer-type species.

The Guardian

State officials warn that four jellyfish species—lion’s mane, Atlantic sea nettle, moon jellyfish and sea walnut—are responsible for most encounters. Stings this season have produced pain lasting up to a full day, with many children experiencing vomiting. The typical reaction time for earlier summers was 30–45 minutes, indicating a heightened severity this year.

The Guardian

Health officials advise anyone stung to rinse the area with vinegar, then apply hot water or a warm towel. Injuries to the face or neck should prompt immediate medical attention. They caution against the common myth of urinating on a sting, noting it can worsen pain.

The Guardian

• “The jellyfish for the past couple weeks have been very plentiful … The type of stings we’re seeing this summer, we haven’t really seen in past summers.” — Nico Caceres, the Rehoboth Beach patrol captain

The Guardian

• “We have been seeing a lot of smaller children who actually end up vomiting a lot,” — Nico Caceres, the Rehoboth Beach patrol captain

The Guardian

• “The best available data show that our air temperatures, and thus water temperatures, are rising over time and droughts may become more frequent. So those conditions will favor higher numbers of summertime sea jellies.” — Chris Petrone

The Guardian

These statements capture the unprecedented abundance of jellyfish, the alarming symptoms observed in children, and the scientific link to rising temperatures and drought conditions.

The Guardian