한국수산과학회

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kfas, vol. 54, no. 6, pp.989-999, December, 2021
DOI. https://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
음향을 이용한 남해 연안에 서식하는 상괭이(Neophocaena asiaeorientalis)
의 출현 특성 연구

최슬기·김은호*·손호선1
국립수산과학원 고래연구센터, 1국립수산과학원 남해수산연구소

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°C. 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.

Keyword : Narrow-ridged finless porpoise, Passive acoustic monitoring, Clicks, South sea of South Korea

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