Mnemiopsis populations in those areas were eventually brought under control by the accidental introduction of the Mnemiopsis-eating North American ctenophore Beroe ovata, and by a cooling of the local climate from 1991 to 1993, which significantly slowed the animal's metabolism.
How was the population of mnemiopsis in The black Sea and the Sea of Azov brought under control?
by the accidental introduction of the Mnemiopsis-eating North American ctenophore Beroe ovata,