Target Strength Measurements and Modeling of Walleye Pollock and Pacific Hake
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- Sawada Kouichi
- National Research Institute of Fisheries Engineering
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- Ye Zhen
- Institute of Ocean Science Department of Physics, National Central University
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- Kieser Robert
- Pacific Biological Station
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- McFarlane Gordon A.
- Pacific Biological Station
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- Miyanohana Yoichi
- National Research Institute of Fisheries Engineering
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- Furusawa Masahiko
- Tokyo University of Fisheries
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This paper reports a laboratory target strength (TS) measurement and theoretical modelling of walleye pollock and Pacific hake. The measurements are performed in a tank as a function of fish tilt angle, which is controlled in one-degree steps. A precision echo sounder is used and sphere calibrations are conducted before or after the measurement. A specialized soft X-ray imaging system is used to map the fish swimbladder. The X-ray images are digitized to obtain the fish morphological parameters. Based on these parameters, theoretical TS of the fish is calculated using the approximate deformed cylinder model and the general prolate spheroid model. An advantage of using these models lies in their simplicity and the fact that few parameters are required in the model computation. Calculations indicate a negligible contribution of the fish body to the total scattering in the wide range of tilt angle. The theoretical TS values are compared with the measured values. Agreement between measured and theoretical TS is reasonably good for near normal incidence, but deteriorates for larger tilt angles. The level of agreement is discussed. Obtained maximum and average TS values are nearly equal to or a little bit smaller than the published data. Using the deformed cylinder model, broad band TS characteristics are generated. Our results highlight the usefulness of the simple method to predict fish TS using the deformed cylinder model associated with X-ray imaging.
収録刊行物
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- Fisheries science
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Fisheries science 65 (2), 193-205, 1999
公益社団法人 日本水産学会
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詳細情報 詳細情報について
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- CRID
- 1390282679406312960
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- NII論文ID
- 130003903344
- 10004878054
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- NII書誌ID
- AA10993718
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- COI
- 1:CAS:528:DyaK1MXjt1Srsr0%3D
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- NDL書誌ID
- 4706297
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- ISSN
- 09199268
- http://id.crossref.org/issn/09199268
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- NDL
- Crossref
- CiNii Articles
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- 抄録ライセンスフラグ
- 使用不可