Acoustic Target Strength of the Endangered Chinese Sturgeon (Acipenser sinensis) by Ex Situ Measurements and Theoretical Calculations
文献类型： 外文期刊
作者： Zhang, Hui 1 ; Li, Junyi 1 ; Wang, Chongrui; Wang, Chengyou 1 ; Wu, Jinming 1 ; Du, Hao 1 ; Wei, Qiwei 2 ; Kang, Myoun 1 ;
作者机构： 1.Chinese Acad Fishery Sci, Yangtze River Fisheries Res Inst, Key Lab Freshwater Biodivers Conservat, Minist Agr & Rural Affairs China, Wuhan 430223, Hubei, Peoples R China
2.Chinese Acad Fishery Sci, Yangtze River Fisheries Res Inst, Key Lab Freshwater Biodivers Conservat, Minist Agr & Rural Affairs China, Wuhan 430223, Hubei, Peoples R
关键词： Acipenser sinensis; target strength (TS); acoustic backscatter; echosounder; Yangtze River
期刊名称：APPLIED SCIENCES-BASEL （ 影响因子：2.679； 五年影响因子：2.736 ）
ISSN： 2076-3417
年卷期： 2018 年 8 卷 12 期
页码：
收录情况： SCI
摘要： The Chinese sturgeon, Acipenser sinensis, is a large anadromous and highly endangered protected species. The assessment of its breeding population in the Yangtze River is critically important for effective management and population preservation. Currently, hydroacoustic methods have been widely used to study the adult sturgeons in the river, whereas the acoustic target strength (TS) characteristics of the species have not been studied. In this study, the TS of Chinese sturgeon was carefully evaluated both by ex situ measurements and theoretical calculations. Six Chinese sturgeons (Body Length (BL): 74.0-92.6 cm) were measured by a 199 kHz split echosounder in a 10-m deep net cage. The computed tomography of a Chinese sturgeon (BL: 110.0 cm) was conducted and the Kirchhoff ray mode (KRM) method was used to estimate the theoretical TS. As a result, the mean ex situ TS range of the six specimens was from -26.9 to -31.4 dB, which was very close to the KRM estimation (similar to 1 dB difference). Then, the KRM method was used to predict the TS of Chinese sturgeon as a function of BL in six frequencies commonly used in freshwater environments and to estimate the TS of a representative adult Chinese sturgeon (250 cm) as a function of frequency and tilt angle. This study can provide a good basis for future hydroacoustic studies on the critically endangered Chinese sturgeon.
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