Distribution of the ichthyo-jellyplankton Mnemiopsis leidyi (Agassiz, 1865) in the Marmara Sea

Tamara Shiganova, Ahmet N. Tarkan, Ayhan Dede, Mustafa Cebeci

Institute of Oceanology, Academy of Science, Moscow, RUSSIA
University of lstanbul, Faculty of Aquatic Products, Beyazıt, Istanbul, TURKEY
Department of Navigation, Hydrography and Oceanography, 81647 Çubuklu, Beykoz, Istanbul, TURKEY


In this study, the distribution and the abundance of the abundance of Ctenophora Mnemiopsis leidyi in the Sea of Marmara are investigated. Samples were taken vertically and from surface from 16 stations with special plankton nets. They were determined taxonomically and separated into three different size groups. According to vertical sampling the abundance of M. leidyi was fowld to be approximately 4.3 kg/m 2 near the Bosphorus and 9.7 kg/m 2 near the Dardanelles. According to the surface samples, the abundance was 0.5-0.7 kg/catch in near Bosphorus and 11-13 kg/catch in Dardanelles. It was determined that the population of M. leidyi was distributed between 10 and 30 m. water depth and there were no fish eggs or larvae in the area.

Keywords: Mnemiopsis leidyi, Bosphorus, Marmara Sea, Dardanelles

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