Swimbladder condition and target strength of myctophid fish in the temperate zone of the Northwest Pacific

Yasuma, Hiroki; Sawada, Kouichi; Takao, Yoshimi; Miyashita, Kazushi; Aoki, Ichiro

Swimbladder condition and target strength of myctophid fish in the temperate zone of the Northwest Pacific

Yasuma, Hiroki; Sawada, Kouichi; Takao, Yoshimi et al.

ICES Journal of Marine Science, 2010, 67(1), 135-144

Permalink : https://hdl.handle.net/2115/44574

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アクセス権	open access
URI	https://hdl.handle.net/2115/44574
タイトル	Swimbladder condition and target strength of myctophid fish in the temperate zone of the Northwest Pacific
著者	Yasuma, Hiroki ; Sawada, Kouichi ; Takao, Yoshimi ; Miyashita, Kazushi ; Aoki, Ichiro
著者名 Yasuma, Hiroki
著者名 Sawada, Kouichi
著者名 Takao, Yoshimi
e-Rad_Researcher 70301877 著者名 Miyashita, Kazushi
著者名 Aoki, Ichiro
言語	英語
キーワード	acoustic resonance
	myctophid fish
	swimbladder allometry
	theoretical target strength
発行日	2010-01
出版者	Oxford Journals
収録物名	ICES Journal of Marine Science
巻(号)	67(1)
ページ	135-144
抄録	We report theoretical values of the target strength (TS) of four myctophid fish (Ceratoscopelus warmingii, Myctophum asperum, Diaphus garmani, and D. chrysorhynchus) based on morphometry of the swimbladder. None of the D. chrysorhynchus had an inflated swimbladder, but the other species had both inflated and non-inflated swimbladders, depending on body size. The relationships between swimbladder and body length showed that once gas production started the swimbladders grew faster than the rest of the body (positive allometric growth). However, M. asperum showed regression of the swimbladder after positive allometric growth, so larger specimens had non-inflated swimbladders. Based on the measurements of swimbladder and body length, the theoretical TS values at 38 and 120 kHz were calculated using existing sound-scattering models. In fish with inflated swimbladders, TS values were relatively low (<-67 dB, reduced TScm) at both frequencies. Regression slopes on TS-body length (log) plots were >20, suggesting that their scattering cross sections were not proportional to the square of the body length. In contrast, the TS values of M. asperum decreased with growth in large fish (60-80 mm long) through swimbladder regression. Scattering cross sections of fish without swimbladders were not proportional to the square of the body length over the whole size range. They increased rapidly relative to growth, especially when L/λ < 2.
資源タイプ	学術雑誌論文
出版タイプ	Accepted Manuscript
権利情報	This is a pre-copy-editing, author-produced PDF of an article accepted for publication in ICES Journal of Marine Science following peer review. The definitive publisher-authenticated version ICES Journal of Marine Science, 2010 67(1):135-144 is available online at: http://dx.doi.org/10.1093/icesjms/fsp218
PISSN	1054-3139
関連情報 (isVersionOf)	出版社版DOI https://doi.org/10.1093/icesjms/fsp218