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.
Russian Journal of Marine Biology – Springer Journals
Published: Nov 9, 2011
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