This study aimed to measure the in-situ target strength (TS) of the moon jellyfish (Aurelia aurita) using a 200 kHz scientific echo sounder in a natural coastal environment. The acoustic survey was conducted in the coastal waters of Soho Port, Yeosu, Korea, from June 4 to 5, 2024. TS measurements were performed by installing the transducer in both horizontal and vertical orientations, and the TS distribution characteristics were analyzed. The measured TS values ranged from -89.8 to -64.8 dB in the horizontal direction and from -90.0 to -59.1 dB in the vertical direction, showing no significant difference between detection orientations (p<0.05). Additionally, a bell diameter-wet weight relationship for Aurelia coerulea was derived based on the specimens collected at the survey site. The empirical TS model proposed by Mutlu (1996) was applied to estimate TS values using the measured morphological data, and the results exhibited a similar trend to the field-measured TS distribution. These findings provide fundamental data for acoustic monitoring and stock assessment of jellyfish populations in natural environments.

서 론
재료 및 방법
    조사일시 및 해역
    음향 시스템 및 보름달물해파리 채집
결 과
    에코그램
    송수파기의 수평 및 수직 탐지 방향별 보름달물해파리의TS 빈도 분포
    보름달물해파리의 우산직경-체중 관계식
고찰 및 결론
References

• 민은비(전남대학교 수산과학과 학생) | Eun-Bi MIN (Student, Department of Fisheries Science, Chonnam National University, Yeosu 59626, Korea)
• 신중로(전남대학교 수산과학과 학생) | Joong-Ro SHIN (Student, Department of Fisheries Science, Chonnam National University, Yeosu 59626, Korea)
• 강태종(전남대학교 수산과학과 학생) | Tae-Jong KANG (Student, Department of Fisheries Science, Chonnam National University, Yeosu 59626, Korea)
• 황두진(전남대학교 해양생산관리학과 교수) | Doo-Jin HWANG (Professor, School of Marine Technology, Chonnam National University, Yeosu 59626, Korea) Corresponding author