Fig. 7. (A) Heart rate (beats min^-1), (B) stroke volume (ml beat^-1), (C) cardiac output (ml min^-1) and haemolymph flow rates (ml min^-1) through the (D) anterior aorta, (E) left anterolateral artery, (F) right hepatic artery, (G) posterior aorta and (H) sternal artery of 10 Cancer gracilis. Crabs that had been fed 21 h previously were monitored during a 3 h control period in 100%SW; low salinity conditions (65%SW) were then initiated for 6 h, after which control conditions were restored for an additional 6 h. Values are means ± s.e.m. The beginning of the low salinity and 100%SW periods are marked. In certain cases error bars are small and do not show clearly on figures.