Abstract：
: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_name
J Fish Bioljournal_title
Journal of fish biologyauthors
Kawabata Y,Nishihara GN,Yamaguchi T,Takebe T,Teruya K,Sato T,Soyano Kdoi
10.1111/jfb.12502subject
Has Abstractpub_date
2014-11-01 00:00:00pages
1757-65issue
5eissn
0022-1112issn
1095-8649journal_volume
85pub_type
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