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RISS 인기검색어
- 검색키워드
- 주제어 : Area backscattering strength (검색결과 3 건)
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황두진 ( Doo Jin Hwang ),박주삼 ( Ju Sam Park ),이유원 ( Yoo Won Lee ) 한국수산과학회 2004 한국수산과학회지 Vol.37 No.3
N/A The hydro-acoustic method is widely used for estimating biomass and distribution of fisheries resources along the coast and in the ocean. High costs and time are necessary to construct systems for this method and to initially educate specialists. It has been used in fisheries of advanced nations like Japan and Norway, because it is more efficient than other methods. In order to research the behavior of fish around an artificial reef using an echo sounder, volume backscattering strength (SV) and fish per cubic meter (FPCM) of darkbanded rockfish around the model artificial reef in a water tank were measured. Moreover, behavior of fish was observed in an adjacent artificial reef, which was constructed at Tongyeong marine ranching area. Following that, an acoustics survey was conducted at Mirukdo around the Tongyeong marine ranching area, in order to understand the spatial distribution and strength of fisheries resources. Very high patches of fish were found in a wide area around the artificial reef. It is thought that an approaching fish school around the artificial reef can be measured accurately by using an echo sounder of high resolution. Moreover, use of other monitoring methods like of diving or ROV simultaneous with an echo sounder is required in order to grasp the species and ecology of fish inhabiting the area around the artificial reef.
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과학어군탐지기를 이용한 서해 중심 연안의 부어류 자원량 추정
김은호(Eun Ho KIM),윤은아(Eun A YOON),황두진(Doo Jin HWANG) 전남대학교 수산과학연구소 2008 수산과학연구소논문집 Vol.17 No.2
The distribution and biomass of pelagicfish in centeral coast of west sea of Korea were studied by the scientific echo sounder from September 2006 to June 2007, every four season. The survey was performed by using 200kHz dual beam system, transmitter-receiver and indicator afterward recorded data was handled by using echo view software. The biomass was estimated using identification of object fish, acoustics data of volume backscattering coefficient(Sv), area backscattering coefficient(Sa), target strength(TS), and length and weight of target fish by sampling. Based on the survey line, divided the survey waters with 6 sections was 227.68km2. The area backscattering strength(SA) of each season indicated -62.0~-68.0dB in September(autumn), -63.0~-72.0dB in November(winter), -65.0~-71.0dB in March(spring) and -55.0~-66.0dB in June(summer). In addition, the mean target strength(TS) of many fishes distributed in the survey area in September, November, March and June was -57.0dB, -69.2dB, -69.1dB and -64.8dB, respectively. The catch rate by offshore stow net was occupied 98~99% of anchovy in september, 36~44% of akiami paste shrimp in november, 35~59% of akiami paste shrimp in march and 53~64% of southern rough shrimp, 13~14% of beka squid in june.
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과학어군탐지기를 이용한 서해 중심 연안의 부어류 자원량 추정
김은호 외 전남대학교 수산과학연구소 2008 수산과학연구소논문집 Vol.17 No.2
The distribution and biomass of pelagicfish in centeral coast of west sea of Korea were studied by the scientific echo sounder from September 2006 to June 2007, every four season. The survey was performed by using 200kHz dual beam system, transmitter-receiver and indicator afterward recorded data was handled by using echo view software. The biomass was estimated using identification of object fish, acoustics data of volume backscattering coefficient(Sv), area backscattering coefficient(Sa), target strength(TS), and length and weight of target fish by sampling. Based on the survey line, divided the survey waters with 6 sections was 227.68km2. The area backscattering strength(SA) of each season indicated -62.0~-68.0dB in September(autumn), -63.0~-72.0dB in November(winter), -65.0~-71.0dB in March(spring) and -55.0~-66.0dB in June(summer). In addition, the mean target strength(TS) of many fishes distributed in the survey area in September, November, March and June was -57.0dB, -69.2dB, -69.1dB and -64.8dB, respectively. The catch rate by offshore stow net was occupied 98~99% of anchovy in september, 36~44% of akiami paste shrimp in november, 35~59% of akiami paste shrimp in march and 53~64% of southern rough shrimp, 13~14% of beka squid in june.
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