Fig. 5. Drag coefficient measurements and hydrodynamic regimes for adult zebrafish. Black circles denote dead drag measurements from tethering experiments (N=6; nine Re values per individual) and red circles are in vivo drag measurements (N=4; three coasts per individual). (A) The broken line lies at the mean value for the inertial drag coefficient (C_inert) at Re>1000. (B) The broken line denotes the mean value of the viscous drag coefficient (C_visc) at Re<300. (C) The viscous regime occurs where C_visc remains relatively constant, and the inertial regime is defined as the range where C_inert does not vary with Re.