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Cruise report of the cetacean sighting survey in the northern part of the Sea of Okhotsk in 2021
P.S. Guscherov I.A. Naberezhnykh, A.N. Bashtovoy, M.D. Kenin, O.N. Katugin, I.F. Belokoblylskiy and Tomio Miyashita
The cetacean sighting survey was conducted in the northern part of the Sea of Okhotsk in 2021. The vessel is a stern trawl type research vessel with a barrel for observation. The objective of the survey is to obtain information on distribution and abundance of large whales using the normal closing mode. The period of survey was from August 8 to September 10 (34 days), the northern and the southern boundaries are 57?00N and 60?00N, respectively and the western and the eastern boundaries are 139?00E and 157?00E, respectively. During the research distance of 1299,26 n.miles by closing mode for large cetaceans in the research area and 963,41 n.miles by passing mode during transit.
Over the entire period of research, the following species of cetaceans were confirmed: common minke whale (18 schools ? 21 animals), like minke whale (1-2), North Pacific right whale (2- 4), bowhead whale (1-1), humpback whale (1-1) fin whale (8-12), sperm whale (1-1), killer whale (6-32), white whale (1-6), Pacific white-sided dolphin (6-294), Dalli type Dall's porpoise (8-19), truei-type Dall?s porpoise (2-3), unidentified type Dall's porpoise (112-351), unidentified large cetacean (4-5), unidentified small cetacean (2-7).