海洋音響学会誌
Online ISSN : 1881-6819
Print ISSN : 0916-5835
ISSN-L : 0916-5835
39 巻 , 3 号
選択された号の論文の1件中1~1を表示しています
論文
  • Muhammad KURNIA, Kohji IIDA, Tohru MUKAI
    2012 年 39 巻 3 号 p. 93-102
    発行日: 2012年
    公開日: 2015/12/09
    ジャーナル フリー
    We discuss the acoustic characteristics of the three-dimensional target strength (3DTS) of defrosted Japanese Jack mackerel and Chub mackerel. The target strength of fish in the whole aspect was measured in a tank by changing the horizontal incident angle from 0° to 360° by 1° steps and the pitch angle from 0° to 90° by 10° steps. Prior to measurement of TS, morphological parameters including swim bladder size and shape were measured by soft X-ray for theoretical estimation. The theoretical TS of fish were calculated using the prolate-spheroid model based on morphological parameters and were compared with the measured values. Results showed that both the maximum and the minimum TS were proportional to body length, and the directivity of the TS was strongly associated with its orientation. The TS of fish changed significantly with the changing yaw and pitch angle of the fish, but remained fairly constant as the roll angle of the fish changed. The maximum and minimum TS were found at the broadside and end-on aspects of the fish, respectively.
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