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http://dx.doi.org/10.5657/KFAS.2021.0989

Emergence Characteristics of Narrow-ridged Finless Porpoise Neophocaena asiaeorientalis Using Passive Acoustic Survey in the South Sea of South Korea  

Choi, Seulgi (Cetacean Research Institute, National Institute of Fisheries Science)
Kim, Eunho (Cetacean Research Institute, National Institute of Fisheries Science)
Sohn, Hawsun (South Sea Fisheries Research Institute, National Institute of Fisheries Science)
Publication Information
Korean Journal of Fisheries and Aquatic Sciences / v.54, no.6, 2021 , pp. 989-999 More about this Journal
Abstract
The sound of finless porpoises Neophocaena asiaeorientalis was recorded with an acoustic recorder to confirm their emergence in the South Sea of South Korea in February, June, and November 2020. Sea water temperature and salinity were also measured. In addition, a sighting survey was conducted to observe the behavior of the finless porpoises and the marine environment, and the clicks of the finless porpoises were recorded every day. The results showed that they always emerged in the survey area. The finless porpoises mainly foraged, whereas some played or rested. The water temperature range of areas where the finless porpoises emerged was 7.5-23.5℃. Assuming that the number of clicks corresponds to the number of finless porpoises, the finless porpoises emerged the most during spring. The emergence decreased during winter and was the lowest during autumn. The finless porpoises emerged more during the daytime than during the nighttime in all seasons, indicating a temporal difference in the usage of the survey area. This might be due to the movement of prey organisms according to regional characteristics. A long-term survey and research on habitat use and environment is needed to manage and conserve the finless porpoises.
Keywords
Narrow-ridged finless porpoise; Passive acoustic monitoring; Clicks; South sea of South Korea;
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