Fig. 7. Coral-reef fish larvae need to make a transition from top swimming performance to hypoxia tolerance when they settle on a reef. Relationship between body mass and (A) oxygen consumption at maximal swimming speed, and (B) hypoxia tolerance (measured as [O₂]_crit) in larvae and juveniles of Chromis atripectoralis. Note the transient drop in maximum oxygen uptake and simultaneous increase in hypoxia tolerance (seen as a drop in [O₂]_crit) that occur when the larvae settle on the reef and become post-settlement juveniles. Data from Nilsson et al. (Nilsson et al., 2007b).