Cruise report of the cetacean sighting survey in the central part of the Sea of Okhotsk in 2020
Pavel S. Gushcherov, Igor A. Naberezhnykh, Petr A. Tiupeleev, Anton A. Novozhilov,Vitaliy I. Samonov and Tomio Miyashita
The cetacean survey was conducted in the central part of the Sea of Okhotsk in 2020. 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 7 to September 7 (32 days), the northern and the southern boundaries are 57?40N and 50?00N, respectively and the western and the eastern boundaries are 147?00E and 152?00E, respectively. During the research distance of 1177,28 n.miles by closing mode for large cetaceans in the research area and 909,36 n.miles by passing mode during transit, the following species were sighted ? common minke whale (19 schools ? 24 animals), like minke whale (3-3), North Pacific right whale (9-13), sperm whale (1-1), fin whale (12-23), killer whale (6-23), white whale (2-49), Dalli type Dall's porpoise (16-45), truei-type Dall?s porpoise (3-10), unidentified type Dall's porpoise (111-270), unidentified large cetacean (4-6), unidentified small cetacean (1-4),unidentified cetacean (4-7).