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

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Title: Swimbladder condition and target strength of myctophid fish in the temperate zone of the Northwest Pacific
Authors: Yasuma, Hiroki Browse this author
Sawada, Kouichi Browse this author
Takao, Yoshimi Browse this author
Miyashita, Kazushi Browse this author →KAKEN DB
Aoki, Ichiro Browse this author
Keywords: acoustic resonance
myctophid fish
swimbladder allometry
theoretical target strength
Issue Date: Jan-2010
Publisher: Oxford Journals
Journal Title: ICES Journal of Marine Science
Volume: 67
Issue: 1
Start Page: 135
End Page: 144
Publisher DOI: 10.1093/icesjms/fsp218
Abstract: 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.
Rights: 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
Type: article (author version)
URI: http://hdl.handle.net/2115/44574
Appears in Collections:北方生物圏フィールド科学センター (Field Science Center for Northern Biosphere) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 安間 洋樹

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