Marine Biology

, Volume 112, Issue 2, pp 237–242 | Cite as

Life cycle ofRhopilema nomadica: a new immigrant scyphomedusan in the Mediterranean

  • A. Lotan
  • R. Ben-Hillel
  • Y. Loya


Rhopilema nomadica is an Indopacific scyphomedusan, which has migrated into the eastern Mediterranean in recent years. Large aggregations of the medusae were recorded in Haifa Bay, Israel, reaching 5.5×105 medusae per square nautical mile during summer 1989. The life cycle ofR. nomadica from planula to young medusa is described. Fertilization is external and planulae are formed within a few hours at 20°C. After settlement, polyps were fed withArtemia sp. nauplii and developed into polydisc strobilae within 45 d. The strobilation process was completed within 7 d, and the liberated ephyrae developed into young medusae within 2 mo. Asexual reproduction occurred mainly via podocyst formation. The population explosion ofR. nomadica could be attributed to its high reproductive potential.


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Copyright information

© Springer-Verlag 1992

Authors and Affiliations

  • A. Lotan
    • 1
  • R. Ben-Hillel
    • 1
  • Y. Loya
    • 1
  1. 1.Department of ZoologyTel-Aviv UniversityTel-AvivIsrael

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