The bad news is that the arrival of dense swarms of jellyfish (in the Mediterranean the Pelagica Noctiluca, pictured) cannot be predicted, because it all depends on winds and currents. Scholars note that by now the arrival of new swarms happens every year, aided by rising water temperatures, but also by the widening of the Suez Canal, which facilitates their arrival from the Red Sea.
THOSE DAMN WATER BALLAST
One of the main causes is water ballast from container ships. In fact, to make these huge ships stable, water is loaded into huge tanks that stabilize, thanks to sophisticated software, the buoyancy. Loading water into the Red Sea also “pulls up” jellyfish and their larvae. The stabilization process by water ballast is continuous: they embark and discharge water. Passed into the Mediterranean, container ships then discharge water containing jellyfish larvae collected in the Red Sea. And the omelette is done.
IF YOU BITE…
So before you throw yourself overboard from the boat, take a careful look. But avoid alarmism if you get stung by a jellyfish. And remember, wet the affected area with seawater, without rubbing even if it itches. Best to always have an aluminum chloride astringent gel on board to apply. It works and can be found in pharmacies.