Abstract
To understand the causes and to control harmful blooms of the giant Nomura’s jellyfish Nemopilema nomurai, it is essential to study the seed population (benthic polyps) and its environment. To locate the habitat of polyps, the first step is to find ephyrae shortly after detachment from polyps. We found five ephyrae of N. nomurai of 1–2 mm diameter for the first time from plankton samples collected at two sites, one specimen in the northwestern East China Sea (32°12.3′N, 123°12′E) and the other four specimens in the Yellow Sea (34°05.8′N, 121°50.0′E), on 22 and 26 May 2011. From the developmental state and water temperature of ca. 16 °C at the sampling stations, the collected ephyrae were estimated to have detached from polyps in early May of the year. Considering the increase of water temperature which induces strobilation and the direction of transport in the northwestern East China Sea and in the Yellow Sea, the locality of the seed polyps of the present specimens is probably the sea-floor close to the Changjiang River mouth and along the coast of Jiangsu Province.
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