과학어군탐지기를 이용한 서해 중심 연안의 부어류 자원량 추정 = Biomass estimation of pelagicfish in centeral coast of west sea of Korea using the scientific echo sounder

다국어 초록 (Multilingual Abstract)

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.