Comparison of measurements and model calculations of target strength of juvenile sandeel in Sendai Bay

DOI JASI Web Site 33 References
  • MATSUKURA RYUICHI
    Japan Sea National Fisheries Research Institute, Fisheries Research Agency
  • SAWADA KOUICHI
    National Research Institute of Fisheries Engineering, Fisheries Research Agency
  • ABE KOKI
    National Research Institute of Fisheries Engineering, Fisheries Research Agency
  • MINAMI KENJI
    Faculty of Fisheries Sciences, Hokkaido University
  • NAGASHIMA HIROSHI
    Miyagi Prefecture Fisheries Technology Institute, Freshwater Fisheries Experiment Station
  • YONEZAKI SHIROH
    National Research Institute of Far Seas Fisheries, Fisheries Research Agency
  • MURASE HIROTO
    The Institute of Cetacean Research
  • MIYASHITA KAZUSHI
    Laboratory of Marine Ecosystem Change Analysis, Field Science Center for Northern Biosphere, Hokkaido University

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Other Title
  • 仙台湾周辺におけるイカナゴ <i>Ammodytes personatus</i> 当歳魚のターゲットストレングス測定とモデル計算による比較
  • 仙台湾周辺におけるイカナゴAmmodytes personatus当歳魚のターゲットストレングス測定とモデル計算による比較
  • センダイワン シュウヘン ニ オケル イカナゴ Ammodytes personatus トウサイギョ ノ ターゲットストレングス ソクテイ ト モデル ケイサン ニ ヨル ヒカク

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Abstract

  The target strength (TS) of juvenile sandeel (3.1-7.7 cm in standard length, SL) was measured for various tilt angles (−30° to 30°) at 120 kHz, and was compared with the theoretical TS calculated using the theoretical sound scattering model. The maximum TS measured at the tilt angle of 0° ranged from −68.8 to −60.8 dB, whereas the range of the theoretical TS was from −68.7 to −61.5 dB. The difference of the measured and theoretical values of the maximum TS was −1.6 to 0.9 dB, and the TS patterns showed good agreement, particularly in the range of the main lobes, in the tilt angle (−10° to 10°). The theoretical model was used to calculate the TS under the same conditions where the specimens were collected. The correlation between the SL and the maximum TS is given by the equation: TS=43.1 log SL−96.1.<br>

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