Most Popular Jellyfish in the US

Most Popular Jellyfish in the USA

There are several species of jellyfish found in the USA, and the most common ones vary depending on the region:

  • In the Puget Sound and off the coast of Oregon, moon jellies are more common in the summer season.
  • In Florida and Hawaii, subtropical jellyfish are more prevalent, and box jellyfish show up after every full moon in Hawaii.
  • Cannonball jellyfish are the most common jellyfish in South Carolina waters during the summer and fall, particularly in Myrtle Beach.

It is worth noting that there is also a species of freshwater jellyfish called Craspedacusta sowerbyi, which is found in lakes and ponds across the USA. This species is not harmful to humans and is most easily identified when it takes the form of a small, bell-shaped jellyfish, known as a hydromedusa.

The most popular jellyfish in the USA vary depending on the region and the time of year. Moon jellies, subtropical jellyfish, box jellyfish, and cannonball jellyfish are some of the most common species found in different parts of the country.

Most Dangerous Jellyfish in the US

The most dangerous jellyfish in the US is the box jellyfish, also known as the sea wasp. The box jellyfish is considered the deadliest jellyfish in the world, with venomous tentacles that can cause severe pain, paralysis, and even death. The venom of the box jellyfish is one of the most potent in the world, containing toxins that attack the heart, nervous system, and skin cells, causing intense reactions. The sea wasp jellyfish has the ability to kill up to 60 people. The box jellyfish is found primarily in the waters around Australia, but it has also been reported in the Gulf of Mexico and the Atlantic coast of the US.

Other dangerous jellyfish species in the world include the Irukandji jellyfish, which is the most venomous of its kind and is found in the waters around Australia. The Portuguese man o’ war, which is not a true jellyfish but a siphonophore, is also considered dangerous due to its venomous tentacles.

Symptoms of a Jellyfish Sting

Jellyfish stings can cause instant pain and inflamed marks on the skin, and in some cases, they can cause more whole-body illness. The symptoms of jellyfish stings depend on the type of jellyfish that caused the sting. If the sting is minor, the person may feel slight pain, itching, burning, or throbbing. A jellyfish sting may look like a rash with red, purple, or brown patches. More severe symptoms of jellyfish stings include difficulty breathing, chest pain, muscle cramps, skin blisters, numbness or tingling, nausea or vomiting, difficulty swallowing, abdominal pain, and excessive sweating. In rare cases, jellyfish stings can be life-threatening.

It is important to seek medical help right away if the person experiences severe symptoms or if the sting covers a large area of the body. In most cases, jellyfish stings get better over a few days or weeks with home treatment. Home treatment includes rinsing the affected area with vinegar, removing tentacles with tweezers, soaking the affected area in hot water, taking pain relievers, and applying topical creams or ointments to relieve itching and pain

Most Dangerous Jellyfish Species by States (USA)

StateMost Dangerous Jellyfish SpeciesRemarks
FloridaBox Jellyfish (Sea Wasp)Box jellyfish can be found around Florida’s waters and are particularly prevalent in Hawaii.
HawaiiBox Jellyfish (Sea Wasp)Box jellyfish show up after every full moon in Hawaii and are known for their potent venom.
TexasBox Jellyfish (Sea Wasp)Found in the Gulf of Mexico, the box jellyfish is a potential threat to Texas beachgoers.
South CarolinaPortuguese Man o’ WarNot a true jellyfish, but a siphonophore, the Portuguese Man o’ War can be found along the coast.
CaliforniaSea NettleSea nettles are found along the Pacific coast and can deliver painful stings.
OregonLion’s Mane JellyfishLion’s mane jellyfish can be found along the Pacific Northwest coast, known for their long tentacles and painful sting.
WashingtonLion’s Mane JellyfishLion’s mane jellyfish are commonly found in the Puget Sound and can cause painful stings.
MarylandSea NettleSea nettles are common in the Chesapeake Bay and can deliver painful stings.
VirginiaSea NettleSea nettles are prevalent in the Chesapeake Bay and can cause painful stings.
North CarolinaPortuguese Man o’ WarWhile not a true jellyfish, the Portuguese Man o’ War can be found along the North Carolina coast and is considered dangerous due to its venomous tentacles.

Please note that this table is not exhaustive and the presence of dangerous jellyfish may vary depending on the season, water temperature, and other factors. Always exercise caution when swimming in the ocean and check with local authorities about the presence of jellyfish in the area.

StateMost Common Jellyfish Types
MaineLion’s Mane Jellyfish
New HampshireMoon Jellyfish
MassachusettsSea Nettle, Moon Jellyfish
Rhode IslandSea Nettle, Moon Jellyfish
ConnecticutAtlantic Sea Nettle, Moon Jellyfish
New YorkLion’s Mane Jellyfish, Sea Nettle, Moon Jellyfish
New JerseySea Nettle, Moon Jellyfish
DelawareSea Nettle, Moon Jellyfish
MarylandSea Nettle, Moon Jellyfish
VirginiaSea Nettle, Moon Jellyfish
North CarolinaSea Nettle, Moon Jellyfish
South CarolinaCannonball Jellyfish, Sea Nettle
GeorgiaCannonball Jellyfish, Sea Nettle
FloridaAtlantic Sea Nettle, Cannonball Jellyfish, Moon Jellyfish
State NameMost Common Jellyfish Types
CaliforniaMoon Jelly (Aurelia aurita), Purple-striped Jelly (Chrysaora colorata), Pacific Sea Nettle (Chrysaora fuscescens)
FloridaPortuguese Man o’ War (Physalia physalis), Moon Jelly (Aurelia aurita), Cannonball Jellyfish (Stomolophus meleagris), Sea Nettle (Chrysaora quinquecirrha), Upside-down Jellyfish (Cassiopea xamachana)
MaineLion’s Mane Jellyfish (Cyanea capillata), Moon Jelly (Aurelia aurita), Atlantic Sea Nettle (Chrysaora quinquecirrha)
MarylandSea Nettle (Chrysaora quinquecirrha), Moon Jelly (Aurelia aurita), Bay Nettle (Chrysaora chesapeakei)
MassachusettsLion’s Mane Jellyfish (Cyanea capillata), Moon Jelly (Aurelia aurita), Atlantic Sea Nettle (Chrysaora quinquecir