Sexual dimorphism in body shape of Antarctic krill (Euphausia superba) and its influence on target strength

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概要

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• Sexual dimorphism in the body shape of Antarctic krill (Euphausia superba) was investigated and its influence on target strength (TS) was clarified using a theoretical scattering model. The TS which is used to convert acoustic backscatter to krill density was also presented. Body shape data were obtained from 456 specimens (54 juveniles, 200 males, and 202 females) collected off Adélie Land using a Rectangular Midwater Trawl. The sexual dimorphism manifested as a swollen cephalothorax in female krill with body lengths exceeding 40 mm. The TS of female krill was higher than those of male krill at low frequencies, even when body lengths were the same. This is because of the Rayleigh scattering region and the transition region to the geometric scattering region. The influence of the sexual dimorphism on the TS was small at frequencies exceeding 70 kHz, which are close to the geometric scattering region. The regression curve derived from the predicted TS of 456 specimens was in reasonable agreement with the measured TS in other previous studies, and the regression curve could be applied to the acoustic surveys of Antarctic krill.

著者

• 茂木 正人

  東京海洋大学海洋科学部魚類学研究室

• 茂木 正人

  東京海洋大学

• Amakasu Kazuo

  Tokyo University of Marine Science and Technology

• Masato Moteki

  Faculty Of Marine Science Tokyo University Of Marine Science And Technology 4-5-7 Konan Minato Tokyo

• Moteki Masato

  Laboratory Of Ichthyology Tokyo University Of Marine Science And Technology

• Moteki Masato

  Laboratory Of Ichthyology Tokyo University Of Fisheries

• Ishimaru Takashi

  Tokyo University of Fisheries

• Ishimaru Takashi

  Tokyo Univ. Fisheries Tokyo Jpn

• Ono Atsushi/moteki

  Department Of Ocean Sciences Tokyo University Of Marine Science And Technology 4-5-7 Konan Minato-ku

• Amakasu Kazuo/ono

  Tokyo University Of Marine Science And Technology 4-5-7 Konan Minato-ku Tokyo 108-8477 Japan/tokyo U

• Amakasu Kazuo/ono

  Tokyo University Of Marine Science And Technology 4-5-7 Konan Minato-ku Tokyo 108-8477 Japan/tokyo U

• Ono Atsushi

  Tokyo University of Marine Science and Technology, 4-5-7 Konan, Minato-ku, Tokyo 108-8477, Japan

• Moteki Masato

  Tokyo University of Marine Science and Technology, 4-5-7 Konan, Minato-ku, Tokyo 108-8477, Japan

• Amakasu Kazuo

  Department Of Ocean Sciences Tokyo University Of Marine Science And Technology 4-5-7 Konan Minato-ku

• Ishimaru Takashi

  Department Of Ocean Sciences Tokyo University Of Marine Science And Technology 4-5-7 Konan Minato-ku

• Ishimaru Takashi

  Department Of Ocean Sciences Tokyo University Of Marine Science And Technology 4-5-7 Konan Minato 10

• Moteki Masato

  Department Of Ocean Sciences Tokyo University Of Marine Science And Technology 4-5-7 Konan Minato 10

• Moteki Masato

  Department Of Ocean Sciences Tokyo University Of Marine Science And Technology 4-5-7 Konan Minato-ku

• Moteki Masato

  Faculty Of Marine Science Tokyo University Of Marine Sciences And Technology 4-5-7 Konan Minato Toky

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