Prolate spheroidal models for predicting general trends of fish target strength

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概要

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• General trends of the target strength of fish or other organisms are investigated by using prolate spheroidal scattering motheds. The soft spheroids is taken as the model of the swim bladder of fish, and the liquid spheroid for the fish body without bladder. Backscattering amplitudes are calculated for the spheroids with typical physical parameters of actual fish. They are shown as the frequency and size dependences, the backscattering patterns, and density and sound speed dependences. These results are compared with experiment observed target strengths of sardine, mackerel, krill, etc. A good aggreement was found. The dorsal-aspect target strength of bladder fish shows little frequency dependence and is approximately proportional to the squared body length. Almost all the backscattered energy is attributed to the bladder. The target strength of the fish or organisms without a bladder is very small. Their swimming orientation and physical parameters of the body considerably affect the scattering to cause variability in the target strength.

• 社団法人日本音響学会の論文

著者

• FURUSAWA Masahiko

  National Research Institute of Fisheries Engineering

• Furusawa M

  National Res. Inst. Fisheries Engineering Ibaraki Jpn

関連論文

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• Application of echo-trace analysis to estimation of behaviour and target strength of fish
• Prolate spheroidal models for predicting general trends of fish target strength
• Experimental Investigation of an Acoustic Method to Estimate Fish Abundance Using Culture Nets : Acoustical Measurements and Instrumentation

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