Target strength estimation of black porgy Acanthopagrus schlegeli using acoustic measurements and a scattering model
Target strength estimation of black porgy Acanthopagrus schlegeli using acoustic measurements and a scattering model
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DOI：
10.1111/j.1444-2906.2004.00875.x
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发表时间：
2004-10-01
影响因子：
1.9
通讯作者：
Miyashita, K
中科院分区：
文献类型：
--
作者：
Kang, D;Sadayasu, K;Miyashita, K
黑鲷在日本、韩国和台湾的海洋牧场孵化并放生，以维持沿海地区的渔业资源。如果使用声学方法进行野外调查，则需要物种的目标强度（TS）信息将声学数据转换为生物量密度。采用活鱼非原位测量法（笼法和鱼钩法）、冲击冷冻鱼系留法和基于鱼类形态的Kirchhoff射线模式（KRM）声散射模型，在38和120 kHz（分束波束）下测量了黑鲷（Acanthopagrus schlegeli） 15.5 ~ 32.9 cm叉长（9只）的靶强度。TS38kHz = 20log10FL - 64.6 (r = 0.77), TS120kHz = 20log10FL - 65.2 （r = 0.70）。KRM模型的值分别为TS38kHz = 20log(10)FL - 64.8 （r = 0.88）和TS120kHz = 20log(10)FL - 65.4 （r = 0.80）。离地测量值与KRM模型对平均TS的一致性很好。相比之下，栓系法（TS38kHz, = 20log10FL - 69.3 [r = 0.42]）的结果与其他两种方法明显不同，这可能是由于空气中冲击冻结过程的影响。非原位测量和散射模型的结果为研究TS和进行黑孔隙的声学测量提供了基础信息，尽管拴绳方法必须进行修改。
Black porgy are hatched and released in marine ranching areas in Japan, Korea and Taiwan to maintain fisheries resources in coastal areas. If acoustic methods are used for field surveys, target strength (TS) information on the species is needed to convert acoustic data to biomass density. Target strength of black porgy (Acanthopagrus schlegeli) 15.5 - 32.9 cm fork length (nine individuals) was measured at 38 and 120 kHz (split beam) by ex situ measurements (cage and fishhook methods) of living fish, a tethered method with shock-frozen fish, and an acoustic scattering model, the Kirchhoff ray mode (KRM) model based on fish morphology. The ex situ TS-to-fork length (FL, cm) relationships were TS38kHz = 20log(10)FL - 64.6 (r = 0.77) and TS120kHz, = 20log10FL - 65.2 (r = 0.70). The values for the KRM model were TS38kHz = 20log(10)FL - 64.8 (r = 0.88) and TS120kHz = 20log(10)FL - 65.4 (r = 0.80). The agreement between the ex situ measurements and the KRM model for the mean TS was very good. In contrast, the results for the tethered method (TS38kHz, = 20log10FL - 69.3 [r = 0.42]) differed markedly from the other two methods, perhaps because of the effects of the shock-freezing procedure in air. The results of the ex situ measurements and scattering model provide basic information for studying TS and conducting acoustic surveys of black porgy, even though the tethered method must be modified.