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SC/69B/ASI/07Rev1
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Resource ID
22009
Access
Open
Document Number
SC/69B/ASI/07Rev1
Full Title
Cruise report of the cetacean sighting survey in the northeastern Sea of Okhotsk in 2023
Author
P.S. Gushcherov, I.A. Naberezhnykh, O.N. Katugin And Shingo Minamikawa
Authors Summary
The survey was conducted was from August 4 to September 6 (34 days) in the northeastern Sea of Okhotsk by Russian scientists of Pacific branch of ®VNIRO¯ (®TINRO¯). During the research distance of 1071,25 n.miles by closing mode for large cetaceans in the research area and 1140,43 n.miles by passing mode during transit. Thus, the distance traveled in the research area was 100% of the planned.
Over the entire period of research, the following 8 species of cetaceans.
This year, photo-ID was applied to two groups of animals encountered - killer whales and North Pacific right whale. In total, 26 whales have been tentatively identified.
Materials obtained in 2016-2017 and 2023 show that the species composition of whales in the Shelikhov Bay and Kamchatka peninsula remains virtually unchanged, and their meeting places are confined to both offshore and coastal areas, which could be due to the presence and the availability of their food items.
Therefore, the continuation of joint Russian-Japanese research is very important and relevant for further assessment of the status of cetacean stocks in the Sea of Okhotsk.
Publisher
IWC
Publication Year
2024
Abstract
The cetacean sighting survey was conducted in the northeastern Sea of Okhotsk in 2023. The vessel was a stern trawl type research vessel with a barrel for observation. The objective of the survey was to obtain information on distribution and abundance of large whales using the normal closing mode. The period of survey was from August 4 to September 6 (34 days) in the northeastern Sea of Okhotsk in the coordinates: 51ø00N - 62ø00N, and 152ø00E - 162ø00E. The research distance was 1071.25 nautical miles using closing mode for large cetaceans in the research area and 1140.43 nautical miles using passing mode during transit.
Over the entire period of research, the following species of cetaceans were confirmed by observation: common minke whale (13 schools ? 14 animals), resembling minke whale (1-1), North Pacific right whale (8-18), humpback whale (6-18), fin whale (28-56), sperm whale (7-11), killer whale (5-23), Pacific white-sided dolphin (2-169), Dalli type Dall's porpoise (14-45), Truei type Dall?s porpoise (0-1), unidentified type Dall's porpoise (117-323), unidentified dolphin (1-6), unidentified large cetaceans (6-8), unidentified small cetacean (1-1).