Portuguese Man o' War
Physalia physalis · Also known as: bluebottle, man-of-war
Occasional Ocean City / Assateague wash-up: purple-blue float with long, potent tentacles. Not a true jellyfish, and a serious sting risk.
Quick facts
| Group | Jellyfish / siphonophore |
|---|---|
| Likelihood nearby | ★★☆☆☆ |
| Habitats | Ocean beach, Offshore / ocean, Assateague State Park, Assateague National Seashore |
| Seasons (this coast) | summer, fall |
How to recognize them
- Gas-filled blue-to-purple sail floating on the surface; long blue tentacles trail below.
- Looks like a balloon with strings when stranded on sand.
Biology notes
- Siphonophore colony—many specialized animals acting as one.
- Blown north by winds and currents; Mid-Atlantic strandings are episodic, not daily.
Where to see them around Ocean City
- Ocean beaches after strong onshore winds from the south/southeast.
- News and lifeguard alerts during rare local influxes.
When to look
- Most reports late summer–fall during warm-water years.
Viewing tips & etiquette
- Do not touch—even stranded tentacles sting. Warn others and give wide berth.
- Seek first aid for severe reactions; vinegar is commonly recommended for man o’ war stings.
