Brennmaneter

Brennmaneter is a common name used in Norwegian (and related Nordic languages) for several jellyfish species that can deliver painful stings. The Swedish term brännmanet is closely related. These organisms belong to the class Scyphozoa and are marine cnidarians with a bell-shaped body and long, trailing tentacles that contain stinging cells called nematocysts.

Brennmaneter have the typical jellyfish life strategy, capturing prey with their tentacles and drifting with currents. They can reach notable sizes, and their tentacles may extend well beyond the bell. Like other jellyfish, they reproduce through a life cycle that includes a sessile polyp stage and a free-swimming medusa stage. Their venom is used primarily for prey capture and defense against predators.

Distribution and habitat vary by species, but brännmaneter are commonly encountered in coastal and shelf waters in northern Europe and the North Atlantic, especially during warmer months when plankton is abundant. They are often found near beaches and in bays, where human contact is most likely.

Stings from brännmaneter can cause a burning sensation, redness, swelling, and pain. Most stings are local and resolve without serious complications, but severe reactions can occur, particularly in children or individuals with allergies. First aid includes removing any attached tentacles with gloves or tweezers, rinsing the area with seawater, and avoiding rubbing the skin. Do not use freshwater or rub the area, as these can worsen symptoms. For some species, applying vinegar to the affected area can help inactivate undischarged nematocysts; local guidance should be followed. Seek medical attention if symptoms are widespread, if breathing is affected, or if there is signs of an anaphylactic reaction.