Laboratory behavioural observation and computational fluid dynamics (CFD) analysis were conducted to examine whether the movement of the elongated dorsal and pelvic spines changed the hydrodynamic drag in white-streaked grouper Epinephelus ongus larvae. The behavioural observation in the tank revealed that the larvae extended the dorsal and pelvic spines during passive transport and retracted during swimming; the angles of the dorsal and pelvic spines in relation to the anteroposterior axis were larger during the passive transport (mean±s.d. = 28・84±14・27 and 20・35±15・05°) than those during the swimming (mean±s.d. = 2・59±5・55 and 0・32±6・49°). The CFD analysis indicated that the relative hydrodynamic drag acting on the larvae was approximately 1・25 times higher when the spines were extended (passive transport) than when the spines were retracted (swimming), suggesting that the E. ongus larvae have an ability to adjust their hydrodynamic drag depending on the behavioural context. Journal of Fish Biology
雑誌名
Journal of Fish Biology
巻
85
号
5
ページ
1757 - 1765
発行年
2014-11
出版者
Wiley-Blackwell
ISSN
00221112
DOI
10.1111/jfb.12502
権利
c 2014 The Fisheries Society of the British Isles.
This is the accepted version of the following article: Journal of Fish Biology, 85(5), pp.1757-1765; 2014, which has been published in final form at http://dx.doi.org/10.1111/jfb.12502
著者版フラグ
author
引用
Journal of Fish Biology, 85(5), pp.1575-1765; 2014
The effect of spine postures on the hydrodynamic drag in Epinephelus ongus larvae
JFB85_1757.pdf
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