Abstract

The scyphomedusa Rhopilema nomadica, recorded in July 2006 from Lakonikos Gulf, on the Ionian coast of Greece, is a Lessepsian alien established in the Levantine Sea. The jellyfish’s painful stings may pose a danger to swimmers. Because of its invasiveness and its impact it is considered among the worst invasive marine species in European Seas.

Highlights

  • Among the invasive alien marine biota in the Mediterranean Sea none threatens human health and well-being more than Rhopilema nomadica Galil, 1990 (Cnidaria: Scyphozoa: Rhizostomeae)

  • Local municipalities in Israel reported a decrease in holiday makers frequenting the beaches because of the public’s concern over the painful stings inflicted by the jellyfish (Avian et al 1995, Kokelj et al 1995)

  • The proliferation of R. nomadica was attributed to its high reproductive capacity (Lotan et al 1992) and probably to the eutrophic character of the coastal areas (Kideys and Gucu 1995)

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Summary

Introduction

Among the invasive alien marine biota in the Mediterranean Sea none threatens human health and well-being more than Rhopilema nomadica Galil, 1990 (Cnidaria: Scyphozoa: Rhizostomeae) (in Galil et al 1990). The nomadic jellyfish had entered the Mediterranean through the Suez Canal in the 1970s, and since the mid 1980s forms large swarms annually along the Levantine coast. When the jellyfish swarms draw nearer shore they adversely affect tourism, fisheries and coastal installations.

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Conclusion

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