Marine Biology

, Volume 112, Issue 2, pp 237–242

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


  • A. Lotan
    • Department of ZoologyTel-Aviv University
  • R. Ben-Hillel
    • Department of ZoologyTel-Aviv University
  • Y. Loya
    • Department of ZoologyTel-Aviv University

DOI: 10.1007/BF00702467

Cite this article as:
Lotan, A., Ben-Hillel, R. & Loya, Y. Mar. Biol. (1992) 112: 237. doi:10.1007/BF00702467


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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© Springer-Verlag 1992