Changes in target strength (TS) values of sandfish when sandfish was alive and dead were investigated using ex-situ at120 kHz. TS values measured by tilt angles with ‑50∼+50 degrees showed ranges from ‑71.0 to ‑53.3 dB for live sandfish, ‑63.1~‑46.3 dB for thawed sandfish, and ‑70.0~‑50.4 dB after 24 hours from thawed, respectively. It was shown that while TS values were similar between the case of live and the case of after 24 hours from thawed, mean TS values were higher by approximately 5 dB in the case of immediate thawed sandfish. It was also seen that TS values were similar between the case of thawed sandfish and the case of after 21 hours from live. The results showed that TS values of live sandfish were different from those of frozen sandfish. It implies that when estimating TS of frozen fish, the influx of bubbles and changes of body should be considered.

• 윤은아(전남대학교 해양기술학부) | Eun-A YOON (Division of Marine Technology, Chonnam National University, Yeosu 59626, Korea)
• 이경훈(전남대학교 해양기술학부) | Kyounghoon LEE (Division of Marine Technology, Chonnam National University, Yeosu 59626, Korea) Corresponding author
• 황강석(국립수산과학원 연근해자원과) | Kangseok HWANG (Fisheries Resource Research Division, National Institute of Fisheries Science, Busan 46083, Korea)
• 이형빈(국립수산과학원 서해수산연구소) | Hyungbeen LEE (West Sea Fisheries Research Institute, National Institute of Fisheries Science, Incheon 22383, Korea)
• 한인우(전남대학교 수산과학과) | Inwoo HAN (Department of Fisheries Sciences, Chonnam National University, Yeosu 59626, Korea)
• 황두진(전남대학교 해양기술학부) | Doo-Jin HWANG (Division of Marine Technology, Chonnam National University, Yeosu 59626, Korea)