Volume 21 Issue 2
Apr.  2025
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CHEN Guobao, CHENG Gao, NIU Lulian, ZOU Jianwei, YU Jie, CHEN Pimao. Application of fishery acoustic frequency difference technology in fishery resource assessment of marine ranching in southern sea area of Yintan, Guangxi[J]. South China Fisheries Science, 2025, 21(2): 38-46. DOI: 10.12131/20240129
Citation: CHEN Guobao, CHENG Gao, NIU Lulian, ZOU Jianwei, YU Jie, CHEN Pimao. Application of fishery acoustic frequency difference technology in fishery resource assessment of marine ranching in southern sea area of Yintan, Guangxi[J]. South China Fisheries Science, 2025, 21(2): 38-46. DOI: 10.12131/20240129
shu

Application of fishery acoustic frequency difference technology in fishery resource assessment of marine ranching in southern sea area of Yintan, Guangxi

  • 1 .

    South China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences/Key Laboratory of Marine Ranching, Ministry of Agriculture and Rural Affairs/National Digital Fisheries (Marine Ranching) Innovation Sub-Center/Key Laboratory of Marine Ranching Technology, Chinese Academy of Fishery Sciences/Scientific Observing and Experimental Station of South China Sea Fishery Resources and Environments, Ministry of Agriculture and Rural Affairs/Guangdong Provincial Key Laboratory of Fishery Ecology and Environment/Guangdong Engineering Technology Research Center of Marine Recreational Fishery, Guangzhou 510300, China

  • 2 .

    College of Marine Living Resource Sciences and Management, Shanghai Ocean University, Shanghai 201306, China

  • 3 .

    Beihai Fishery Technology Extension Station, Beihai 536000, China

More Information
  • Received Date: June 06, 2024
  • Revised Date: November 25, 2024
  • Accepted Date: December 24, 2024
  • Available Online: December 29, 2024
    Graphical Abstract
    • Abstract

  • To improve the accuracy of fisheries resource assessment in marine ranching, we conducted an acoustic survey in the marine ranching demonstration area in the southern sea area of Yintan, Guangxi in January 2023, by using two advanced split-beam echo sounders: the EK80 (Operating frequency: 120 kHz) and the EY60 (Operating frequency: 200 kHz), with the biological sampling through bottom trawling. According to the comparison between frequency-difference noise-reduction techniques and traditional noise-reduction methods in the analysis of fisheries acoustic data, compared with traditional techniques, the frequency-difference noise reduction had a higher average target strength (TS) with a smaller variation range when tracking single targets, demonstrating greater technical precision and objectivity. When assessing the fish density across different transects, we found that the average count density obtained through frequency-difference noise reduction was consistently lower than that through traditional methods, showing its reliability in handling acoustic noise in fisheries assessment. For dominant species, the frequency-difference noise reduction showed insignificant differences in the count density for larger individuals, but a significant increase for smaller individuals, highlighting its advantage in enhancing assessment accuracy for fish density. Therefore, using volume backscattering strength (Sv) images processed with frequency-difference noise reduction for fisheries resource density assessment can more effectively eliminate interfering noise and accurately detect smaller biological targets.

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