Estimation of demersal fish biomass using hydroacoustic and catch data in the marine ranching area (MRA) of Jeju

Abstract

Hybrid surveys using hydroacoustic and fish sampling gears such as trammel net, trap were conducted to investigate total biomass, distribution and dominant fish species of the demersal fishes in the marine ranching area (MRA) of Jeju. Four surveys were carried out in June, August, October and November using 38kHz quantitative echo sounder. Catch data using trammel net and trap were used to calculate biomass and to examine dominant fish species. Fish schools were mainly detected in the waters of 20 meters below and around Chagwido waters. By the result of fishing experiments, fish species living in MRA of Jeju were about 40 species, dominant fish species of a detectable fish such as Family Sparidae and Family Monacanthidae etc. were identified 59.4~68.8% of total biomass. Based on the hydroacoustic data, fish length-weight function and target strength information, mean density of the demersal fish estimated were as

Overview of the Applications of Hydroacoustic Methods in South Korea and Fish Abundance Estimation Methods

“…Now, there are five marine ranches in the coastal seas: Tongyeong, Yosu, Uljin, Taean, and Jeju Island (MOMAF, 2004). Thus, there have been many studies on fish density and their distributional characteristics around marine ranches where artificial reefs have been established (Hwang et al, 2004;Kang et al, 2008;Lee et al, 2012). The densities of most fish distributions around the artificial reefs in the coastal seas off Tongyeong and Jeju Island marine ranches were assessed (Hwang et al, 2004;Kang et al, 2008).…”

Distribution of Demersal Fish Based on a Combined Acoustic and Trawl Survey during Day and Night in Costal of the South Sea, Korea

“…, , , (Kang et al, 2003;Kim et al, 2008;Lee et al, 2012). (Everson et al, 1996;Hjellvik et al, 2007).…”

Acoustic observation of the behavior of fish in an artificial reef

“…수중 음향 조사는 시간과 탁도 등의 해양환경에 상관없이 조사가 가능하고, 짧은 시간 동안 많은 정보를 얻을 수가 있다 (Hwang et al, 2004;Kang et al, 2008;Lee et al, 2012) …”