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SC/69A/ASI/18
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Resource ID
19946
Access
Open
Document Number
SC/69A/ASI/18
Full Title
Research plan of the cetacean sighting survey in the northeastern Sea of Okhotsk in 2023
Author
P. S. Gushcherov, I. A. Naberezhnykh, O.N. Katugin, Shingo Minamikawa
Authors Summary
In 2023 cruise planned in Shelikhov Bay and coastal waters west of the Kamchatka Peninsula.
As in the cases of the last surveys, the Russian research vessel, Vladimir Safonov will be used in the survey. A total of 24 crews is onboard the vessel.
The research area is set in the northeastern Sea of Okhotsk, namely, Shelikhov Bay and the coastal waters west of the Kamchatka Peninsula. The pre-determined track line was set from the random selected start point using Distance. Planned survey distance is 444.2 n.miles in block c and 629.3 n.miles in block d, respectively. The vessel will start at the northern most way point 1 in block «c» and cover the research area from north to south following the way point number. The survey will be finished at the final way point 15 in block d. The way points and/or track lines are subject to change due to force majeure.
Normal closing mode is primarily used in the research area. Two observers conduct searching using naked eye and confirm by binocular. Three observer teams with determined members operate in two hours shifts. The survey is to be conducted for a maximum of 14 hours basically when the weather conditions are suitable for observations: visibility better than 1.5 n.miles and the wind speed less than 7.5m/s. The vessel speed is planned to be 9.5 knots with adjustment to avoid vibration of vessel.
Distance and angle measurement training is planned to be conducted at the earlier part of the survey. The experiment to evaluate the measurement error is to be conducted around the middle of the survey.
When gray whale, North Pacific right whale, humpback whale and killer whale are found, attempts will be made to take photograph for the individual photo-identification.
Publisher
IWC
Publication Year
2023
Abstract
The nineth dedicated systematic cetacean sighting survey will be conducted in the northeastern Sea of Okhotsk using a Russian research vessel, B??????? ??????? (VLADIMIR SAFONOV), in 2023. 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 will be from 4 August to 6 September (34 days). During the transit to the research area, the vessel will conduct the sighting survey in passing mode. The distance and angle estimation training and experiment will be conducted. Photo-identification of cetaceans such as northern right whales, gray whales and humpback whales will be attempted.