New Scientist: THEY called it the blob that ate the Black Sea. Thirty years ago, a ship from North America sailed up the Bosphorus and dumped ballast water containing comb jellyfish from back home. The invader – Mnemiopsis leidyi – went crazy, gobbling up plankton and triggering a catastrophic decline in marine life, including commercial fisheries. At one point its biomass reached a billion tonnes, 10 times the world’s annual fish landings. Around a decade later an unknown ship, probably from the Bay of Bengal,…

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