Jellyfish are found in the vast majority of oceans. Their filaments contain poisonous cells that plant themselves in the skin upon contact. Depending on the species and the people, the consequences can range from a mild itch to death in rare cases.
In the water, jellyfish are not always easy to spot. If signs indicate the presence of dangerous jellyfish, it is imperative to follow the instructions and in some cases, avoid swimming. To limit direct contact, you can swim in wetsuits and with water shoes. Watch out for stranded jellyfish as the venom can remain active for several hours.
In the event of a serious bite
Some tropical oceans are home to particularly poisonous jellyfish, such as the Australian box jellyfish or other cubozoa.. In the geographical areas concerned, emergency services must be called quickly if a bite causes: a purplish whip-shaped lesion, loss of consciousness, increased heart rate, severe pain in several parts of the body, difficulties breathing, vomiting… While waiting for the arrival of help, the Australian authorities advise to pour vinegar on the tentacles to limit the spread of the venom. If this is not possible, seawater can be used. Then carefully remove the remaining tentacles, for example with forceps.
In case of less serious bites
Apart from these species, the majority of jellyfish are not very poisonous for humans. However, they can cause itching or burning. In the event of a bite, you must return to the beach and then rinse with sea water. Do not use alcohol, urine or fresh water, as this can aggravate the bite. It is then recommended to remove the venomous cells with forceps or protected hands. Then, to relieve the pain, several public agencies recommend soaking the area in hot water for several tens of minutes. If pain persists, or if other symptoms appear, seek medical attention.