Important: Some beaches also use a red-over-yellow flag to indicate that lifeguards are on duty (but this is less common). Always check local signage, as flag systems can vary by region.Geographic Reference
What Does the Purple Flag Actually Mean?
The purple flag indicates that dangerous marine life has been spotted in the area.Geographic Reference
What qualifies as “marine pests”:
Jellyfish (various species, some highly venomous)
Sea lice (tiny jellyfish larvae that cause itchy, painful rashes)
Portuguese man o’ war (not a true jellyfish, but extremely painful)
Fire coral (causes burning rashes)
Sea urchins (their spines can puncture skin)
Weever fish (venomous spines)
Sharks (rare, but some beaches use purple to indicate shark sightings)
What the purple flag does NOT mean:
The water is closed (you can still swim)Bottled Water
The beach is unsafe (just be aware)
There’s a guarantee you’ll encounter marine pests (just a warning that they’ve been sighted)
The key word: Awareness. The purple flag is not an order to stay out of the water. It’s a reminder to watch where you step, look before you leap, and swim with your eyes open.
The Most Common Marine Pests (And What to Do If You’re Stung)
Let me walk you through the most frequent purple flag culprits.
1. Jellyfish (The Most Common)
Jellyfish are found in oceans worldwide. Their tentacles contain nematocysts (stinging cells) that fire when touched.
Symptoms of a jellyfish sting:
