The distribution and abundance of scyphomedusae (Scyphozoa) of the family Ulmaridae in the pelagic zone of the Sea of Okhotsk and the Sea of Japan |
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| Authors: | E N Il’inskii A V Zavolokin |
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| Institution: | (1) Centre for Marine and Coastal Studies, University of New South Wales, Sydney, NSW 2052, Australia;(2) Department of Organismic Biology, Ecology and Evolution, University of California, 621 Charles E. Young Drive South, Los Angeles, CA 90095-1606, USA;(3) Coral Reef Research Foundation, Koror, Palau |
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| Abstract: | The distribution and abundance of jellyfish of the family Ulmaridae was studied based on the data of trawl surveys conducted
in the Sea of Okhotsk (1998–2006) and the Sea of Japan (2003) in the fall. The jellyfish Aurelia aurita mainly inhabits the waters of the Sea of Japan, while in the Sea of Okhotsk small quantities of this species were recorded
in southern areas, and solitary individuals, off North Sakhalin. Aurelia limbata tends to shelf waters of the Sea of Okhotsk, being less abundant in the southern deepwater area and in the Sea of Japan.
Phacellophora camtschatica, in contrast, aggregates mostly over deep basins, whereas in shallow areas a significant quantity of this species was found
only off West Kamchatka. In the northern Sea of Okhotsk, the species A. limbata dominated in biomass and abundance among Ulmaridae. During the studied period, its biomass varied from 27 to 803 kg/km2 and its abundance varied from 69 to 1706 ind/km2. In the southern Sea of Okhotsk, as a rule, P. camtschatica prevailed (1–16 kg/km2 and 6–46 ind/km2). In the Sea of Japan, the most abundant species was A. aurita (29 kg/km2 and 104 ind/km2). The jellyfish size structure in catches is presented. |
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