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수중촬영조사법과 음향자원조사법을 활용한 울주군 연안 소규모 바다목장 해역의 어류 군집 조사 KCI 등재

Visual census and hydro-acoustic survey of demersal fish aggregations in Ulju small scale marine ranching area (MRA), Korea

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수산해양기술연구 (Journal of the Korean Society of Fisheries and Ocean Technology)
한국수산해양기술학회(구 한국어업기술학회) (The Korean Society of Fisheriers and Ocean Technology)
초록

Visual census and hydro-acoustic survey was carried out at Ulju small scale marine ranching area (MRA) to estimate demersal fish aggregations on September and November 2013. In this hydro-acoustic survey, the authors combined an image sonar with a scientific echo sounder to monitor an underwater situation and compare two acoustic data. Consequently, visual census survey was useful to estimate fish species composition for hydro-acoustic survey, because it is easy to identify aggregated fish species and overcome limits on a fishing depth and ability of an conventional fishing gear like a bottom gill-net or a fish trap at marine ranching area. Mean fish density was estimated as 0.757 g/m2 on September and 0.219 g/m2 on November and Fish abundance was finally calculated as 1.51ton (coefficient of variation, CV=13.1%) on September and 0.44ton (CV=47.7%) on November, respectively. Hydro-acoustic survey combined with the image sonar was useful to monitor fish aggregations and estimate fish stocks around artificial reefs at shallow coastal MRA. We were able to easily identify the underwater structures like an artificial reef and a fishing rope as well as fish aggregations from image sonar data. Therefore, the method was effective to separate unwanted echo signals in acoustic data of scientific echo sounder.

저자
  • 황보규 | Bo-Kyu HWANG
  • 이유원(군산대학교 해양생산학과) | Yoo-Won LEE (Dept. of Marine Science & Production, Kunsan National University, Gunsan 573-701, Korea) Corresponding author
  • 조현수 | Hyun-Su JO
  • 오정규(군산대학교 해양생산학과) | Jeong-Kyu OH (Dept. of Marine Science & Production, Kunsan National University, Gunsan 573-701, Korea)
  • 강명희(군산대학교 해양생산학과) | Myounghee KANG (Dept. of Marine Science & Production, Kunsan National University, Gunsan 573-701, Korea)