State Beaches to Fly Purple Flags Warning of Portuguese Man O' War
The Department of Environmental Management is announcing that it
will be flying purple flags at state beaches warning swimmers of the presence
of the Portuguese Man o' War, a dangerous sea creature with long tentacles and
a painful sting.
DEM beach managers closed Scarborough State Beach to swimming at
around 5 PM on Tuesday after the second of two beach goers was stung by
something. Beach staff were able to retrieve a Portuguese Man o' War from the
water and identify it. A purple flag means that swimmers should swim at their
own risk.
Although referred to as a jellyfish, the Portuguese Man o' War
actually is a siphonophore, a colony of different organisms working together as
one and specialized to live in the water column. It is a predatory species.
It uses its feeding tentacles to sting and paralyze small
fishes, crustaceans, and other invertebrates. DEM's Division of Marine
Fisheries conducted a survey of coastal waters during the last week of August
but did not see or find any man o' war.
"What often is the case at this time of year is that a warm
core ring has peeled off from the Gulf Stream and come close to the Rhode
Island coast," said Jason McNamee, DEM Deputy Director for Natural
Resources and a marine biologist.
"It likely has brought in a slug of warm water that can contain all manner of interesting creatures. These marine events are usually short-lived."
Typically, the prevailing summer wind is from the southwest, but
over the weekend it often was blowing in from the southeast – which is directly
onshore at Scarborough and could also explain the dead Minke whale that came in
with the tide September 6.
DEM is cautioning swimmers to swim at their own risk and be
vigilant. The tentacles of the man o' war can grow to 30 feet and longer. They
"contain stinging nematocysts, microscopic capsules loaded with coiled,
barbed tubes that deliver venom capable of paralyzing and killing small fish
and crustaceans," according to the National Oceanic and Atmospheric Administration.
"If swimmers see something that looks like a balloon
floating on top of the water, they should stay far away," said McNamee.
"Once the man o' war gets into the surf zone, if the water is rough, the
tentacles can break apart and they can continue to sting even while unattached.
The sting is very painful and can leave scars on people with more sensitive
skin."
A Portuguese Man o' War sting should be treated by carefully
remove remaining tentacles with fine tweezers or with a gloved hand (a plastic
bag works in a pinch) and rinsing the affected area with white vinegar to
prevent any remaining stinging cells from firing. Then, soak the skin in hot
but not scalding water (110 – 113F) or take a hot shower for at least 20
minutes. The heat will denature the protein in the venom. If symptoms do not go
away or pain gets worse, contact a healthcare provider.
DEM staff will be monitoring all beaches for signs of the
Portuguese Man o' War in the coming days.
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