Scientists Puzzled By Jellyfish Absence In Maltese Waters
The usually abundant jellyfish have almost disappeared from Maltese waters this summer, leaving marine scientists puzzled.
According to marine biologist Alan Deidun, the absence of the gelatinous creatures, which in recent years have swarmed Malta’s beaches, is hard to explain and has raised questions across the Mediterranean.
Deidun noted that although past seasons have seen large blooms of species like the mauve stinger (which in some years disrupted swimmers and even long‑distance swims), none of the expected blooms have materialised so far.
He suggested several possible causes: perhaps a predator (even one not yet identified) is feeding on jellyfish eggs or juveniles, or ocean currents are preventing typical influxes of jellyfish from neighbouring regions.
He also explained that most jellyfish reproduce during the winter months, with eggs maturing over two to three months. If spring comes without a new generation of blooms, then the problem may lie deeper in the lifecycle of the species.
“If the situation repeats itself, and we don’t see blooms of jellyfish in the spring … then it could indicate that something is affecting that part of their life cycle,” Deidun told Times of Malta.
Still, Deidun cautioned against over‑reaction, pointing out that large, regular jellyfish blooms are actually a relatively recent phenomenon for Malta. Historically, such events were sporadic.
He stressed the limited understanding scientists have: even after decades of research, jellyfish remain “one of the most elusive creatures … we only see a tiny part of their lifespan.”
Meanwhile, as jellyfish numbers remain low, other marine species typically less prevalent in Maltese waters are showing up in higher numbers, including invasive fish like the highly toxic silver‑cheeked toadfish. Deidun observed that the “tropicalisation” of the Mediterranean, with warmer waters allowing new species to settle, may be playing a role.
In short, while bathers may be enjoying clearer seas, the unusual absence of jellyfish is raising environmental questions and underscoring how much remains unknown about marine ecosystems.
Did you see any jellyfish last summer?
Credit: @etranter and @guidememalta via Instagram
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