Fig. 4.

Fin bending and modeling of fluid movement associated with the pectoral fins. (A) Fin movement during abduction and adduction of the pectoral fins demonstrates asymmetry in bending between these phases of movement. (B) Flow modeled in a representation of fin morphology and movement of larval zebrafish. (C) Flow in a manipulated model in which the pectoral fin remains straight as they are abducted and adducted though the fin beat cycle. Fin bending during abductions increases fluid-folding in larval zebrafish, suggesting that it is adapted to support respiratory exchange (Green et al. 2013). Images are an output from modeling performed by M. H. Green and O. Curet in association with Green et al. (2013).