Abstract

The method of fundamental solutions has been applied to evaluate the influence of fish models geometrical features on the target strength (TS) directivity and TS frequency response of swimbladdered fish. Simplified models were considered for two fish species: gilt-head sea bream (Sparus aurata, Linnaeus 1758) and Atlantic salmon (Salmo salar, Linnaeus 1758), and different geometrical details of their morphology were studied, such as backbone presence, and its curvature or the inclusion of vertebrae modulation. Swimbladder shape and tilt, together with the inclusion of backbone (and its realistic curvature) for dorsal measurements were the most important features for proper estimation of mean TS. The estimation of mean TS is considered including the effect of fish tilt, the echosounder frequency, and the fish-to-transducer distance.

中文翻译：

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鱼骨干模型的几何特征对泳鱼数值目标强度的影响

摘要

基本解法已被用于评估鱼模型几何特征对游泳鱼目标强度（TS）方向性和TS频率响应的影响。考虑了两种鱼类的简化模型：金头鲷（Sparus aurata，Linnaeus 1758）和大西洋鲑鱼（Salmo salar），Linnaeus 1758），并研究了其形态的不同几何细节，例如骨架的存在，曲率或椎骨调制的变化。摆臂的形状和倾斜度，以及用于背部测量的主干（包括其实际曲率）在内，是正确估计平均TS的最重要特征。考虑平均TS的估计，包括鱼倾斜，回声频率和鱼到换能器距离的影响。