The comb jellyfish Mnemiopsis leidyi (IMAGE) Helmholtz Centre for Ocean Research Kiel (GEOMAR) Caption The comb jellyfish Mnemiopsis leidyi originates from the American east coast. It was introduced into the Black Sea in the early 1980s. As a result, anchovy stocks there declined drastically. In 2006, Mnemiopsis leidyi was also detected in the Baltic Sea for the first time. Credit Cornelia Jaspers, GEOMAR/DTU Aqua Usage Restrictions In the context of this press release only. License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.