
In a video shared to social media, marine biologist Alan Deidun shared footage sent to him of one of the few jellyfish in the Mediterranean which actively swims against currents.
Known as the sea lung or sea barrel (scientific name Rhizostoma pulmo), this species is excluded from particularly warm waters and needs extensive sandy bottom patches.
It only inflicts a mild sting despite its large size. It is also quite infrequent within Maltese waters, with this particular rule-breaker filmed off the southern shores of Sicily.
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